KR102372183B1 - Method and apparatus for beam measurement and management in a wireless system - Google Patents

Abstract

The present disclosure relates to a 5G or pre-5G communication system to be provided to support a higher data rate after a 4G communication system such as LTE. According to various embodiments, as a user equipment (UE) for beam management in a wireless communication system, the UE transmits transmission signals for a group of at least two transmit (Tx) beams from a base station to a base station , BS) and at least one transceiver configured to receive from and at least one processor operatively coupled to the at least one transceiver. The at least one processor is configured to configure, based on the transmit signals, a receive beam set including at least one transmit beam from each of the group of at least two transmit beams and a receive (Rx) beam corresponding to each of the at least one transmit beams. and the receive beam set is the same for a group of at least two transmit beams. The transceiver is further configured to transmit a report message including information on at least one of the at least one transmit beam or the receive beam set to the BS.

Description

Method and apparatus for beam measurement and management in a wireless system

BACKGROUND This disclosure relates generally to advanced communication systems. More specifically, the present invention relates to beam measurement and management in a wireless communication system.

Efforts are being made to develop an improved 5G communication system or pre-5G communication system in order to meet the increasing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, the 5G communication system or the pre-5G communication system is called a system after the 4G network (Beyond 4G Network) communication system or after the LTE system (Post LTE).

In order to achieve a high data rate, the 5G communication system is being considered for implementation in a very high frequency (mmWave) band (eg, such as a 60 gigabyte (60 GHz) band). In order to alleviate the path loss of radio waves and increase the propagation distance of radio waves in the ultra-high frequency band, in the 5G communication system, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used. ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed.

In addition, for network improvement of the system, in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud RAN), and an ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Technological development is in progress.

In addition, in the 5G system, FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), which are advanced coding modulation (Advanced Coding Modulation: ACM) methods, and FBMC (Filter Bank Multi Carrier), NOMA, which are advanced access technologies, (non orthogonal multiple access), and sparse code multiple access (SCMA) are being developed.

The 5th generation (5G) mobile communication, which is expected to be initially commercialized around 2020, is gaining momentum in recent years with global technological activity for various candidate technologies in industry and academia. Candidate elements of 5G mobile communication are large-scale antenna technologies from legacy cellular frequency bands to high frequencies to provide beamforming gain and support increased capacity, and to flexibly accommodate various services/applications with various requirements. new waveforms (eg, new radio access technology (RAT)), new multiple access schemes to support large-scale connectivity, and the like. The International Telecommunication Union (ITU) has identified three main usage scenarios for International Mobile Telecommunication (IMT) after 2020: enhanced mobile broadband (eMBB), large-scale machine type communication (MTC), and ultra reliable and low latency (URLL) communication. classified into groups. In addition, ITC supports maximum data rates of 20 gigabits per second (Gb/s), user experience data rates of 100 megabits per second (Mb/s), triple the spectral efficiency, and mobility up to 500 kilometers per hour (km/h). , specified target requirements such as 1 millisecond (ms) latency, a connection density of 106 devices/km2, a 100x network energy efficiency improvement, and an area traffic capacity of 10 Mb/s/m2. Although not all requirements need to be met simultaneously, 5G network design can provide the flexibility to support a variety of applications that meet some of the above requirements on a per-use-case basis.

The above information is provided as background information to aid understanding of the present disclosure. No determination has been made or asserted as to whether any of the above may be applied as prior art with respect to the present disclosure.

In one embodiment, a user equipment (UE) for beam management in a wireless communication system is provided. The UE receives from a base station (BS) a group of at least two transmit beams comprising transmit (Tx) signals generated from different antenna panels, the group of at least two transmit beams being transmitted via reference signals. become -; and a transceiver configured to receive configuration information from the BS that includes a selection constraint for a group of at least two transmit beams. The UE further comprises at least one processor operatively coupled to the transceiver, wherein the at least one processor measures, based on the configuration information, at least one transmit beam from each of the group of at least two transmit beams; and select at least one transmit beam from each of the group of at least two transmit beams and select the same set of receive beams as a receive beam corresponding to each of the selected transmit beams. The UE further includes a transceiver configured to transmit to the BS a report message including information of the selected transmit beams and the selected same receive beam set corresponding to the receive beam.

In another embodiment, a base station (BS) for beam management in a wireless communication system is provided. The BS comprises at least one processor and a transceiver operatively coupled to the at least one processor, wherein the transceiver comprises at least two transmit beams comprising transmit (Tx) signals generated from different antenna panels. transmit a group to a user equipment (UE) for measurement, wherein the group of at least two transmission beams is transmitted via a reference signal; transmit configuration information including a selection constraint for the group of the at least two transmission beams to the UE; It is also configured to receive a report message including information of the selected transmit beams and the same receive (Rx) beam set from the UE. the selected transmit beams are selected by the UE from each of the group of at least two transmit beams; The selected same set of receive beams respectively correspond to measured transmit beams from a group of at least two transmit beams.

In another embodiment, a method of a user equipment (UE) for beam management in a wireless communication system is provided. The method includes receiving from a base station (BS) a group of at least two transmit beams comprising transmit (Tx) signals generated from different antenna panels; receiving, from the BS, configuration information comprising a selection constraint for a group of at least two transmit beams; measuring at least one transmit beam from each of the group of at least two transmit beams based on the configuration information; selecting at least one transmission beam from each of the group of at least two transmission beams and selecting the same reception beam set as the reception beam corresponding to each of the selected transmission beams; and transmitting a report message including information of the selected transmission beams and the selected same reception beam set corresponding to the reception beam to the BS.

Other technical features will become readily apparent to those skilled in the art from the following drawings, description and claims.

Before entering the detailed description below, it may be helpful to set forth definitions of certain words and phrases used throughout this patent specification. The term “couple” and its derivatives denotes any direct or indirect communication between two or more elements, or whether these elements are in physical contact with each other. The terms “transmit”, “receive” and “communicate” and their derivatives include both direct and indirect communication. The terms "include" and "comprise" and their derivatives mean inclusion and not limitation. The term “or” is an inclusive term, meaning “and/or”. The phrase "associated with" and its derivatives include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of), to have a relationship to or with, etc. The term “controller” means any device, system, or part thereof that controls at least one operation. Such a controller may be implemented in hardware or a combination of hardware and software and/or firmware. Functions related to a particular controller may be centralized or distributed locally or remotely. The phrase “at least one,” when used in conjunction with a listing of items, means that different combinations of one or more of the listed items may be used. For example, "at least one of A, B, and C" includes any combination of the following: A, B, C, A and B, A and C, B and C, and A and B and C do.

In addition, various functions described below may be implemented or supported by each of one or more computer programs formed of computer readable program code and embodied in a computer readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, procedures, functions, objects, classes, instances, related data, or portions thereof configured for implementation in suitable computer readable program code. refers to The phrase “computer readable program code” includes sources of code, object code, and types of computer code including executable code. The phrase "computer readable medium" refers to a computer, such as read only memory (ROM), random access memory (RAM), hard disk drive, compact disk (CD), digital video disk (DVD), or any other type of memory. It includes any type of media that can be accessed by “Non-transitory” computer-readable media excludes communication links that carry wired, wireless, optical, transitory electrical or other signals. Non-transitory computer-readable media includes media in which data is permanently stored and media in which data is stored and later overwritten, such as a rewritable optical disc or a removable memory device.

Definitions for other specific words and phrases are provided throughout this patent specification. Those of ordinary skill in the art should understand that in many, if not most, cases, these definitions may apply not only to the prior art, but also to future uses of such defined words and phrases.

For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, in which like reference signs indicate like parts.
1 illustrates an exemplary wireless network in accordance with embodiments of the present invention.
2 illustrates an exemplary eNB according to embodiments of the present invention.
3 illustrates an exemplary UE according to embodiments of the present invention.
4A shows an exemplary high-level diagram of an orthogonal frequency division multiple access transmission path in accordance with embodiments of the present invention.
4B shows an exemplary high-level diagram of an orthogonal frequency division multiple access receive path in accordance with embodiments of the present invention.
5 illustrates an exemplary network slicing according to embodiments of the present invention.
6 illustrates exemplary multiple digital chains in accordance with embodiments of the present invention.
7 illustrates exemplary analog beamforming according to embodiments of the present invention.
8 illustrates an exemplary high-level initial access and beam association procedure according to embodiments of the present invention.
9 illustrates exemplary network node communication within and around a coverage area of a serving cell according to embodiments of the present invention.
10A illustrates an example of a single beam from a single transmit/receive point (TRP) according to embodiments of the present invention.
10B illustrates exemplary two coverage beams in accordance with embodiments of the present invention.
10C illustrates another exemplary two coverage beams according to embodiments of the present invention.
11A is a flowchart illustrating a method for receiving a control signal and measuring and reporting BIs and beam RSRPs according to embodiments of the present invention.
11B illustrates an example of serving and companion beam groups according to embodiments of the present invention.
12 is a flowchart illustrating a physical downlink control channel (PDCCH) decoding method according to embodiments of the present invention.
13 is a flowchart illustrating a method for decoding a physical downlink shared channel (PDSCH) according to embodiments of the present invention.
14 illustrates exemplary joint beam state information (BSI) and channel state information (CSI) reports according to embodiments of the present invention.
15 illustrates an exemplary beam index (BI) selection based on a threshold according to embodiments of the present invention.
16 illustrates an example of BI selection based on grouping and threshold according to embodiments of the present invention.
17A illustrates an exemplary receive (Rx) mode of a UE according to embodiments of the present invention.
17B illustrates another exemplary receive (Rx) mode of a UE according to embodiments of the present invention.
18 is a flowchart of a method for receiving mode operation according to embodiments of the present invention.
19 is a flowchart illustrating a beam management method according to embodiments of the present invention.

1 to 19 described below, and the various embodiments used to explain the principles of the present disclosure in this patent specification, are by way of example only and are not intended to limit the scope of the present disclosure in any way. should not be interpreted. Those skilled in the art will appreciate that the principles of the present disclosure may be implemented in any suitably configured system or apparatus.

The following documents, namely 3GPP TS 36.211 v13.0.0, "E-UTRA, Physical channels and modulation (REF 1);" 3GPP TS 36.212 v13.0.0, "E-UTRA, Multiplexing and Channel coding; (REF 2);" 3GPP TS 36.213 v13.0.0, "E-UTRA, Physical Layer Procedures (REF 3);" 3GPP TS 36.321 v13.0.0, "E-UTRA, Medium Access Control (MAC) protocol specification (REF 4);" and 3GPP TS 36.331 v13.0.0, “Radio Resource Control (RRC) Protocol Specification (REF 5).” are incorporated herein by reference as if fully set forth herein.

1 to 4B below describe various embodiments implemented in wireless communication systems and implemented using orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) communication technologies. The description of FIGS. 1-3 is not meant to indicate physical or structural limitations on the manner in which different embodiments may be implemented. Different embodiments of the present disclosure may be implemented in any suitably configured communication system.

1 illustrates an exemplary wireless network 100 , in accordance with embodiments of the present disclosure. The embodiment of the wireless network 100 shown in FIG. 1 is for illustrative purposes only. Other embodiments of the wireless network 100 may be used without departing from the scope of the present disclosure.

As shown in FIG. 1 , a wireless network 100 includes an eNB 101 , an eNB 102 , and an eNB 103 . The eNB 101 communicates with the eNB 102 and the eNB 103 . The eNB 101 also communicates with at least one network 130 , eg, the Internet, a dedicated Internet Protocol (IP) network, or other data network.

The eNB 102 provides wireless broadband access to the network 130 to a first plurality of user equipments (UEs) within a coverage area 120 of the eNB 102 . The first plurality of UEs may include a UE 111 that may be located in a small business (SB); UE 112 , which may be located in enterprise E; UE 113 that may be located in a Wi-Fi hotspot (HS); UE 114 that may be located in a first residential area (R); UE 115 that may be located in a second residential area (R); and UE 116 , which may be a mobile device M such as a cell phone, wireless laptop, wireless PDA, or the like. The eNB 103 provides wireless broadband access to the network 130 to a second plurality of UEs within a coverage area of the eNB 103 . The second plurality of UEs includes a UE 115 and a UE 116 . In some embodiments, one or more of the eNBs 101 - 103 may communicate with each other and with the UEs 111-116 using 5G, LTE, LTE-A, WiMAX, WiFi or other wireless communication technologies. there is.

Depending on the network type, the term "base station" or "BS" refers to a component (or set of components) configured to provide wireless access to a network, e.g., a transmit point (TP), a transmit-receive point (TRP), an enhanced base station ( eNodeB or eNB), 5G base station (gNB), macrocell, femtocell, WiFi access point (AP), or other wireless capable device. The base station may support one or more wireless communication protocols, such as 5G 3GPP new air interface/access (NR), long term evolution (LTE), LTE-advanced (LTE-A), high speed packet access (HSPA), Wi-Fi 802.11a/ may provide wireless access according to b/g/n/ac and the like. For convenience, the terms “BS” and “TRP” are used interchangeably in this patent specification to denote a network infrastructure that provides wireless access to a remote terminal. Also, depending on the type of network, the term "user equipment" or "UE" may refer to "mobile station", "subscriber station", "remote terminal", "wireless terminal", "terminal", "reception point" or "user equipment" It may refer to any component such as For convenience, the terms “user equipment” and “UE” refer to wirelessly to a BS, whether the UE is a mobile device (eg, a mobile phone or smart phone) or a generally contemplated stationary device (eg, a desktop computer or a vending machine). It is used herein to refer to a remote wireless device that accesses.

The dotted line indicates the approximate extents of the coverage areas 120 and 125, shown in approximate circles, for purposes of illustration and description only. The coverage areas associated with the eNBs, eg, coverage areas 120 and 125, may have other shapes, including irregular shapes, depending on the configuration of the eNBs, and changes in the wireless environment associated with natural and man-made obstacles. should be clearly understood.

As will be described in detail below, one or more of the UEs 111-116 include circuitry, a program, or a combination thereof for efficient CSI reporting for PUCCH in an advanced wireless communication system. In certain embodiments, one or more of the eNBs 101 - 103 include circuitry, a program, or a combination thereof for receiving an efficient CSI report for PUCCH in an advanced wireless communication system.

Although FIG. 1 illustrates an example of a wireless network, various changes may be made to FIG. 1 . For example, a wireless network may include any number of eNBs and any number of UEs in any suitable arrangement. Further, the eNB 101 may communicate directly with any number of UEs to provide them with wireless broadband access to the network 130 . Similarly, each eNB 102 - 103 may communicate directly with the network 130 , providing UEs with direct wireless broadband access to the network 130 . Further, the eNBs 101 , 102 , and/or 103 may provide access to other or additional external networks, such as external telephone networks or other types of data networks.

2 illustrates an example eNB 102 , in accordance with embodiments of the present disclosure. The embodiment of the eNB 102 shown in FIG. 2 is for illustration only, and the eNBs 101 and 103 of FIG. 1 may have the same or similar configuration. However, eNBs come in a variety of different configurations, and FIG. 2 does not limit the scope of the present disclosure to any particular implementation for the eNB.

As shown in FIG. 2 , the eNB 102 includes a plurality of antennas 205a - 205n , a plurality of RF transceivers 210a - 210n , transmit (TX) processing circuitry 215 , and receive (RX) processing. circuit 220 . The eNB 102 also includes a controller/processor 225 , a memory 230 , and a backhaul or network interface 235 .

RF transceivers 210a - 210n receive, from antennas 205a - 205n , incoming RF signals, such as signals transmitted by UEs within network 100 . The RF transceivers 210a - 210n down-convert the inbound RF signals to generate IF or baseband signals. The IF or baseband signals are sent to RX processing circuitry 220, which generates processed baseband signals by filtering, decoding, and/or digitizing the baseband or IF signals. RX processing circuitry 220 sends these processed baseband signals to controller/processor 225 for further processing.

In some embodiments, the RF transceivers 210a - 210n may transmit a beam group including transmission signals corresponding to different antenna panels using MIMO communication technology and may transmit a selection constraint for the beam group. .

In some embodiments, the RF transceivers 210a - 210n may receive a report message including information of a beam received from the UE from the UE. In these embodiments, the UE uses the configuration information to measure the beam from the beam group. In these embodiments, for each of the at least two groups, a receive beam in the same receive beam set is selected by the UE. The selected receive beam corresponds to beams measured by the UE.

In such embodiments, the receive beam set includes at least one receive beam corresponding to the antenna panel or antenna array, and the information includes different transmit signal qualities. In such embodiments, different transmit signal qualities are classified into at least two groups based on the quality of the signals. Each beam corresponding to a different antenna panel or antenna array is transmitted in the same OFDM symbol.

In some embodiments, the RF transceivers 210a - 210n may transmit a transmission signal using a TRP including a plurality of panels and receive a report message including information of the transmission signal. In such embodiments, JT, DPS or interference coordination is applied to the TRPs.

The TX processing circuitry 215 receives analog or digital data (eg, voice data, web data, e-mail, or interactive video game data) from the controller/processor 225 . The TX processing circuitry 215 encodes, multiplexes, and/or digitizes the outgoing baseband data to generate processed baseband or IF signals. The RF transceivers 210a - 210n receive, from the TX processing circuitry 215 , the outbound processed baseband or IF signals, and transmit the baseband or IF signals to the RF signal transmitted via the antennas 205a - 205n. up-converted to

The controller/processor 225 may include one or more processors or other processing devices that control the overall operation of the eNB 102 . For example, controller/processor 225 may receive and reverse forward channel signals by RF transceivers 210a-210n, RX processing circuitry 220, and TX processing circuitry 215 in accordance with well-known principles. It is possible to control the transmission of channel signals. The controller/processor 225 may also support additional functions, such as more advanced wireless communication functions. For example, the controller/processor 225 may support beamforming or directional routing operations in which outgoing signals from the plurality of antennas 205a - 205n are weighted differently to effectively steer in a desired direction. Any of a variety of other functions may be supported at the eNB 102 by the controller/processor 225 .

In some embodiments, the controller/processor 225 may include at least one microprocessor or microcontroller. As described in more detail below, the eNB 102 may include circuitry, a program, or a combination thereof for handling CSI reporting for PUCCH. For example, the controller/processor 225 may be configured to execute one or more instructions stored in the memory 230 configured to cause the controller/processor to process vector quantized feedback components, such as channel coefficients.

In addition, the controller/processor 225 may execute programs and other processes residing in the memory 230 , such as an OS. The controller/processor 225 may move data into or out of the memory 230 as required by the executing process.

The controller/processor 225 is also coupled to a backhaul or network interface 235 . The backhaul or network interface 235 enables the eNB 102 to communicate with other devices or systems over a backhaul connection or over a network. Interface 235 may support communications over any suitable wired or wireless connection(s). For example, when the eNB 102 is implemented as part of a cellular communication system (eg, one that supports 5G, LTE, or LTE-A), the interface 235 allows the eNB 102 to backhaul a wired or wireless It may enable communication with other eNBs through the connection. When the eNB 102 is implemented as an access point, the interface 235 allows the eNB 102 to transmit via a wired or wireless local area network or via a wired or wireless connection to a larger network (eg, the Internet). make it possible Interface 235 includes any suitable structure that supports communications over a wired or wireless connection, for example, an Ethernet or RF transceiver.

Memory 230 is coupled to controller/processor 225 . A portion of memory 230 may include RAM, and another portion of memory 230 may include flash memory or other ROM.

Although FIG. 2 shows an example of an eNB 102 , various changes may be made to FIG. 2 . For example, the eNB 102 may include any number for each component shown in FIG. 2 . As one specific example, the access point may include multiple interfaces 235 and the controller/processor 225 may support routing functions to route data between different network addresses. As another specific example, although shown as including a single instance of TX processing circuitry 215 and a single instance of RX processing circuitry 220 , the eNB 102 may include multiple instances for each (eg, , one per RF transceiver). In addition, various components of FIG. 2 may be combined, further subdivided, or omitted, and additional components may be added according to specific needs.

According to various embodiments, as a base station (BS) for beam management in a wireless communication system, the BS includes at least one processor and a transceiver operatively connected to the at least one processor. The transceiver transmits to a user equipment (UE) for measurement a group of at least two transmit beams comprising transmit (Tx) signals generated from different antenna panels, wherein the group of at least two transmit beams is a reference signals), transmits configuration information including a selection constraint for a group of at least two transmit beams to the UE, and also reports including information of the selected transmit beams and the same receive (Rx) beam set. and receive a message from the UE. The selected transmit beams are respectively selected by the UE from each of the group of at least two transmit beams, and the selected same set of receive beams respectively correspond to measured transmit beams from the group of the at least two transmit beams.

According to various embodiments, the transceiver is further configured to receive a report message including information of each of the at least two transmission beams.

According to various embodiments, the information includes the quality of different transmission signals corresponding to each of a serving group and a companion group, and the reception beam set is at least one antenna panel or at least corresponding to an antenna array. Includes one receive beam.

According to various embodiments, each beam of the group of at least two transmission beams respectively corresponds to a different antenna panel, and each beam of the group of at least two transmission beams is received in the same orthogonal frequency division multiplexing (OFDM) symbol. .

According to various embodiments, the transceiver transmits the transmission signals included in the group of at least two transmission beams from at least two transmission/reception points (TRP) each including a plurality of panels, and transmits the transmission signals related to the at least one TRP. and receive a report message comprising the information.

According to various embodiments, at least one of joint transmission (JT), dynamic point selection (DPS), or interference coordination is applied to at least two TRPs.

3 illustrates an example UE 116 , in accordance with embodiments of the present disclosure. The embodiment of the UE 116 shown in FIG. 3 is for illustrative purposes only, and the UEs 111-115 of FIG. 1 may have the same or similar configuration. However, UEs come in a variety of different configurations, and FIG. 3 does not limit the scope of the present disclosure to any particular implementation for a UE.

As shown in FIG. 3 , UE 116 includes an antenna 305 , a radio frequency (RF) transceiver 310 , TX processing circuitry 315 , a microphone 320 , and receive (RX) processing circuitry. (325). In addition, the UE 116 includes a speaker 330 , a processor 340 , an input/output (I/O) interface (IF) 345 , a touch screen 350 , a display 355 , and a memory 360 . include Memory 360 includes an operating system (OS) 361 and one or more applications 362 .

The RF transceiver 310 receives an inbound RF signal transmitted by the eNB of the network 100 from the antenna 305 . The RF transceiver 310 down-converts the inbound RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is sent to RX processing circuitry 325 which generates a processed baseband signal by filtering, decoding, and/or digitizing the baseband or IF signal. RX processing circuitry 325 transmits the processed baseband signal to speaker 330 (eg, voice data), or to processor 340 for further processing (eg, web browsing data).

In some embodiments, the RF transceiver 310 may receive a group of beams comprising transmit (Tx) signals generated from different antenna panels and receive configuration information including a selection constraint for the group of beams. can do. In such embodiments, groups of beams are transmitted using MIMO communication techniques.

In some embodiments, the RF transceiver 310 may transmit a report message including information of a beam received at the UE.

In such embodiments, this information includes different qualities of transmitted signals, each corresponding to a different group, each beam of the group of beams corresponding to a different antenna panel, and each beam being received in the same OFDM symbol.

In some embodiments, the RF transceiver 310 may receive transmission signals from TRPs including a plurality of panels and receive a report message including information of transmission signals related to the TRPs. In such embodiments, JT, DPS, or interference coordination is applied between TRPs.

The TX processing circuitry 315 receives analog or digital voice data from the microphone 320 or other outgoing baseband data (eg, web data, e-mail, or interactive video game data) from the processor 340 . . TX processing circuitry 315 encodes, multiplexes, and/or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceiver 310 receives the outbound-processed baseband or IF signal from the TX processing circuit 315 and up-converts the baseband or IF signal into an RF signal transmitted through the antenna 305 .

The processor 340 may include one or more processors or other processing devices, and may control the overall operation of the UE 116 by executing the OS 361 stored in the memory 360 . For example, processor 340 controls reception of forward channel signals and transmission of reverse channel signals by RF transceiver 310 , RX processing circuitry 325 , and TX processing circuitry 315 according to well-known principles. can do. In some embodiments, processor 340 includes at least one microprocessor or microcontroller.

Processor 340 may also execute other processes and programs resident in memory 360 , such as processes for CSI reporting for PUCCH. Processor 340 may move data into or out of memory 360 as required by the executing process. In some embodiments, processor 340 is configured to execute applications 362 based on OS 361 or according to signals received from eNBs or an operator. The processor 340 is also coupled to an I/O interface 345 that provides the UE 116 with the ability to connect to other devices such as laptop computers and portable computers. The I/O interface 345 is a communication path between these peripherals and the processor 340 .

In some embodiments, the processor 340 may also measure a beam from a group of beams and select a receive beam from the same set of receive beams. In such embodiments, the selected receive beam corresponds to respective measured beams.

In some embodiments, the processor 340 may also select a beam from a group of beams based on a selection constraint configured by the network and identify groups each comprising a different quality of transmit signals.

Processor 340 is also coupled to touchscreen 350 and display 355 . An operator of the UE 116 may use the touchscreen 350 to enter data into the UE 116 . Display 355 may be, for example, a liquid crystal display, light emitting diode display, or other display capable of rendering text and/or at least limited graphics from web sites.

Memory 360 is coupled to processor 340 . A portion of memory 360 may include random access memory (RAM), and another portion of memory 360 may include flash memory or other read-only memory (ROM). there is.

Although FIG. 3 shows an example of a UE 116 , various changes may be made to FIG. 3 . For example, the various components of FIG. 3 may be combined, further subdivided, or omitted, and additional components may be added according to specific needs. As one specific example, the processor 340 may be partitioned into a plurality of processors, eg, one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Also, although FIG. 3 depicts a UE 116 configured as a mobile phone or smart phone, the UEs may be configured to operate as other types of mobile or stationary devices.

According to various embodiments, a user equipment (UE) for beam management in a wireless communication system includes a transceiver and at least one processor operatively coupled to the transceiver. The transceiver receives, from a base station (BS), a group of at least two transmit beams comprising transmit (Tx) signals generated from different antenna panels, the group of at least two transmit beams transmitting via reference signals. and receive configuration information comprising a selection constraint for a group of at least two transmit beams from the BS. The at least one processor measures, based on the configuration information, at least one transmission beam from each of the group of at least two transmission beams, selects at least one transmission beam from each of the group of at least two transmission beams, and selects each selected transmission beam. and select the same receive beam set as the receive beam corresponding to the beams. The transceiver is further configured to transmit to the BS a report message including information of the selected transmit beams and the selected identical receive beam set corresponding to the receive beam.

According to various embodiments, the at least one processor selects at least one transmit beam from each of the group of at least two transmit beams based on a selection constraint configured by the base station, and selects at least two transmit beams based on the configuration information received from the BS. and generate information related to each of the group of transmit beams, and the transceiver is further configured to transmit a report message including information of each of the group of at least two transmit beams.

According to various embodiments, the information includes qualities of different transmission signals corresponding to each group of at least two transmission beams, respectively.

According to various embodiments, each beam of the group of at least two transmission beams respectively corresponds to a different antenna panel, and each beam of the group of at least two transmission beams is received in the same orthogonal frequency division multiplexing (OFDM) symbol. .

According to various embodiments, the reception beam set includes at least one reception beam corresponding to at least one antenna panel or an antenna array.

According to various embodiments, the transceiver is further configured to receive transmission signals included in the group of at least two transmission beams from at least two transmission/reception points (TRPs) each including a plurality of panels, and the at least one processor is configured and further configured to measure the group of at least two transmission beams based on the information, and the transceiver is further configured to transmit a report message comprising information of transmission signals related to the at least one TRP.

According to various embodiments, at least one of joint transmission (JT), dynamic point selection (DPS), or interference coordination is applied to the at least two TRPs.

4A is a high-level diagram of a transmit path circuit. For example, the transmit path circuitry may be used for orthogonal frequency division multiple access (OFDMA) communication. 4B is a high-level diagram of a receive path circuit. For example, the receive path circuitry may be used for orthogonal frequency division multiple access (OFDMA) communication. 4A and 4B , for downlink communication, the transmit path circuitry may be implemented in a base station (eNB) 102 or a relay station, and the receive path circuitry may be implemented in user equipment (eg, user equipment 116 in FIG. 1 ). can be implemented in In other examples, for uplink communication, receive path circuitry 450 may be implemented in a base station (eg, eNB 102 of FIG. 1 ) or a relay station, and transmit path circuitry may be implemented in a user equipment (eg, user of FIG. 1 ). equipment 116).

The transmit path circuitry includes a channel coding and modulation block 405, a serial-to-parallel (S-to-P) block 410, a size N Inverse Fast Fourier Transform (IFFT) block 415, a parallel-to-serial a (P-to-S) block 420 , an additive cyclic prefix block 425 , and an up-converter (UC) 430 . The receive path circuit 450 includes a down-converter (DC) 455, a remove cyclic prefix block 460, a series-parallel (S-to-P) block 465, a size N fast Fourier transform. a (Fast Fourier Transform, FFT) block 470 , a parallel-to-serial (P-to-S) block 475 , and a channel decoding and demodulation block 480 .

At least some of the components in FIGS. 4A and 4B may be implemented in software, while other components may be implemented by configurable hardware or a mixture of software and configurable hardware. In particular, it is noted that the FFT blocks and IFFT blocks described in the specification of this disclosure may be implemented as configurable software algorithms, where the value of size N may change according to the implementation.

In addition, although the present disclosure relates to an embodiment implementing the Fast Fourier Transform and the Inverse Fast Fourier Transform, this is merely illustrative and should not be construed as limiting the scope of the present disclosure. It will be appreciated that in other embodiments of the present disclosure, fast Fourier transform functions and inverse fast Fourier transform functions may be easily replaced with discrete Fourier transform (DFT) functions and inverse discrete Fourier transform (IDFT) functions, respectively. For DFT and IDFT functions, the value of variable N can be any integer (eg, 1, 2, 3, 4, etc.), and for FFT and IFFT functions, the value of variable N is a power of two (i.e., 1, 2, 4, 8, 16, etc.).

In transmit path circuitry 400, a channel coding and modulation block 405 receives a set of information bits, applies coding (eg, LDPC coding), and modulates the input bits (eg, Quadrature Phase Shift Keying (QPSK)). ) or Quadrature Amplitude Modulation (QAM), to generate a sequence of frequency-domain modulation symbols. Serial-parallel block 410 converts (ie, demultiplexes) serially modulated symbols to parallel data to produce N parallel symbol streams, where N is the IFFT/FFT size used by BS 102 and UE 116 . . A size N IFFT block 415 then performs an IFFT operation on the N parallel symbol streams, producing time-domain output signals. Parallel-to-serial block 420 transforms (ie, multiplexes) the parallel time-domain output symbols from size N IFFT block 415 to produce a serial time-domain signal. Thereafter, the additive cyclic prefix block 425 inserts a cyclic prefix into the time-domain signal. Finally, the up-converter 430 modulates (ie, up-converts) the output of the additive cyclic prefix block 425 to an RF frequency for transmission over the wireless channel. This signal may also be filtered at baseband prior to conversion to RF frequency.

The transmitted RF signal arrives at the UE 116 after passing through the radio channel, where the reverse operations to those at the eNB 102 are performed. Down-converter 455 down-converts the received signal to a baseband frequency, and a remove cyclic prefix block 460 removes the cyclic prefix to produce a serial time-domain baseband signal. Serial-parallel block 465 converts the time-domain baseband signal to parallel time-domain signals. Thereafter, a size N FFT block 470 performs an FFT algorithm to generate N parallel frequency-domain signals. Parallel-to-serial block 475 converts the parallel frequency-domain signals into a sequence of modulated data symbols. Channel decoding and demodulation block 480 demodulates and then decodes the modulated symbols, thereby recovering the original input data stream.

Each of the eNBs 101 - 103 may implement a transmission path similar to a downlink transmission to the user equipment 111-116 , and may implement a receive path similar to an uplink reception from the user equipment 111-116 . Similarly, each of the user equipments 111-116 may implement a transmission path corresponding to the architecture for uplink transmission to the eNBs 101-103, and configure downlink reception from the eNBs 101-103. It is also possible to implement a receiving path corresponding to the architecture for

Various embodiments of the present disclosure provide a flexible CSI feedback framework and structure for high performance, scalability regarding the number and geometry of transmit antennas and LTE enhancement when FD-MIMO with large 2D antenna arrays is supported. . In order to achieve high performance, especially in the case of FDD scenarios, more accurate CSI in terms of MIMO channels is required for the eNB. In this case, embodiments of the present disclosure recognize that the previous LTE (eg, Rel.12 LTE) precoding framework (eg, PMI-based feedback) needs to be replaced. In this disclosure, characteristics of FD-MIMO are considered for this disclosure. For example, the use of closely spaced large 2D antenna arrays that preferentially aim for high beamforming gain rather than spatial multiplexing with a relatively small angular spread for each UE is contemplated. Thus, compression or dimensionality reduction of the channel feedback according to a fixed set of fundamental functions and vectors can be achieved. In another example, updated channel feedback parameters (eg, channel angle spread) may be obtained at low mobility using UE-specific higher layer signaling. In addition, CSI feedback may be performed cumulatively.

Another embodiment of the present disclosure includes a CSI reporting method and procedure with reduced PMI feedback. This PMI report at a lower rate relates to long term DL channel statistics and indicates the selection of a group of precoding vectors recommended by the UE for the eNB. The present disclosure also includes a DL transmission method in which an eNB transmits data to a UE through a plurality of beamforming vectors while using an open loop diversity scheme. Thus, the use of long term precoding ensures that open loop transmit diversity is applied only for a limited number of ports (not all ports are available for FD-MIMO, eg 64). This avoids having to support an excessively high dimension for open loop transmit diversity which reduces CSI feedback overhead and improves robustness when CSI measurement quality is in doubt.

5G communication system use cases have been identified and described. These use cases can be broadly classified into three groups. As an example, enhanced mobile broadband (eMBB) is determined to perform high bits/sec requirements with less stringent latency and reliability requirements. In another example, ultra-reliable and low latency (URLL) is determined with less stringent bits/sec requirements. In another example, massive machine type communication (mMTC) may have a number of devices ranging from 100,000 to a million per km2 but with less stringent reliability/throughput/latency requirements. decided to be These scenarios may also include power efficiency requirements in that battery consumption should be as minimal as possible.

In LTE technologies, a time interval X, which may include one or more of a DL transmission part, a guard, a UL transmission part, and combinations thereof, is dynamic and/or quasi-static is directed to Further, in one example, the DL transmission portion of time interval X includes downlink control information and/or downlink data transmission signal and/or reference signals. In another example, the UL transmission portion of time interval X includes uplink control information and/or uplink data transmission and/or reference signals. Also, the use of DL and UL does not preclude other deployment scenarios (eg sidelink, backhaul, relay). In some embodiments of the present disclosure, “subframe” is another name for “time interval X,” and vice versa. The 5G network supporting these various services is called network slicing.

In some embodiments, “subframe” and “time slot” may be used interchangeably. In some embodiments, a “subframe” refers to a transmit time interval (TTI) that may include an aggregation of a “time slot” for data transmission and reception of the UE.

5 illustrates a network slicing 500 according to embodiments of the present invention. The embodiment of the network slicing 500 shown in FIG. 5 is for illustrative purposes only. One or more of the components shown in FIG. 5 may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

As shown in FIG. 5 , the network slicing 500 includes an operator network 510 , a plurality of RANS 520 , a plurality of eNBs 530a , 530b , a plurality of small cell base stations 535a , 535b , URLL Slice (540a), Smart Watch (545a), Car (545b), Truck (545c), Smart Glasses (545d), Power (555a), Thermometer (555b), mMTC Slice (550a), eMBB Slice (560a), Smart a phone (eg, a cell phone) 565a , a laptop 565b and a tablet 565c (eg, a tablet PC).

The operator network 510 includes a plurality of radios associated with network devices, eg, eNBs 530a and 530b, small cell base stations (femto/pico eNBs or Wi-Fi access points) 535a and 535b, and the like. access network(s) 520 (RAN(s)). The operator network 510 may support various services that depend on the slice concept. In one example, four slices 540a, 550a, 550b, and 560a are supported by the network. URLL slice 540a serves UEs requiring URLL service, eg, car 545b, truck 545c, smart watch 545a, smart glasses 545d, and the like. The two mMTC slices 550a and 550b are for UEs requiring mMTC services such as power meters and temperature control (eg 555b) and cell phones 565a, laptops 565b, tablets 565c, such as Serving one eMBB slice that requires eMBB service.

That is, network slicing is a method of processing various quality of services (QoS) at the network level. In order to efficiently support these various QoS, slice-specific PHY optimization may be required. Devices 545a/b/c/d, 555a/b, 565a/b/c are examples of different types of user equipment (UE). The different types of user equipment (UE) shown in FIG. 5 are not necessarily associated with a particular type of slice. For example, although cell phone 565a, laptop 565b, and tablet 565c are associated with eMBB slice 560a, this is for illustrative purposes only, and these devices may be associated with any type of slice. .

In some embodiments, a device consists of more than one slice. In one embodiment, a UE (eg, 565a/b/c) is associated with two slices: a URLL slice 540a and an eMBB slice 560a. This may be useful to support online gaming applications where graphical information is transmitted via eMBB slice 560a and user interaction related information is exchanged via URLL slice 540a.

In the current LTE standard, slice-level PHY cannot be used, and most PHY functions are used independently of slice. In general, the UE allows the network to (1) quickly adapt to dynamically changing QoS; (2) Consists of a single set of PHY parameters (including transmit time interval (TTI) length, OFDM symbol length, subcarrier interval, etc.) likely to impede simultaneous support of various QoS.

In some embodiments, corresponding PHY designs for handling different QoS with network slicing concept are disclosed. "Slice" refers to a logical entity related to common functions such as numerology, upper layers (including MAC/RRC (medium access control/radio resource control)), and shared UL/DL time-frequency resources. This term was introduced for convenience. Alternative names for "slice" include virtual cells, hyper cells, cells, and the like.

6 illustrates an exemplary plurality of digital chains 600 in accordance with embodiments of the present invention. The embodiment of the number of digital chains 600 shown in FIG. 6 is for illustrative purposes only. One or more of the components shown in FIG. 6 may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

For the mmWave band, the number of antenna elements can be large for a given form factor. However, as shown in FIG. 6, the number of digital chains may be limited due to hardware constraints (eg, the possibility of installing multiple ADCs/DACs at mmWave frequencies). In this case, one digital chain is mapped to multiple antenna elements which can be controlled by a bank of analog phase shifters. One digital chain may correspond to one sub-array that generates a narrow analog beam through analog beamforming. This analog beam can be configured to sweep a wider range of angles by changing the phase shifter bank across symbols or subframes.

The eNB may use one or several transmission beams to cover the entire area of one cell. The eNB may shape the transmit beam by applying the appropriate gains and phase settings to the antenna array. The transmit gain, ie, the power amplification of a transmit signal provided by a transmit beam, is typically inversely proportional to the width or area covered by the transmit beam. At lower carrier frequencies, better propagation losses may enable the eNB to provide coverage with a single transmit beam, ie, adequate received signal quality at all UE locations within the coverage area through the use of a single transmit beam. can guarantee In other words, at lower transmit signal carrier frequencies, the transmit power amplification provided by a transmit beam that has a width large enough to cover the area is one that ensures adequate received signal quality at all UE locations within that coverage area. It may be sufficient to overcome propagation losses.

However, at higher signal carrier frequencies, the transmit beam power amplification corresponding to the same coverage area may not be sufficient to overcome the higher propagation losses, which may result in poor received signal quality at UE locations within the coverage area. there is. To overcome this received signal quality deterioration, the eNB may form multiple transmit beams, each of which provides coverage over a narrower area than the entire coverage area, but due to the use of higher transmit signal carrier frequencies. It provides sufficient transmit power amplification to overcome the higher signal propagation loss.

7 illustrates an exemplary analog beamforming 700 according to embodiments of the present invention. The embodiment of the analog beamforming 700 shown in FIG. 7 is for illustrative purposes only. One or more of the components shown in FIG. 7 may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

5G systems are generally multi-beam-based systems. In such a system, multiple beams are used to cover one coverage area. An example for illustration is shown in FIG. 7 . As shown in FIG. 7 , one gNB has one or more transmission/reception points (TRPs). Each TRP uses one or more analog beams to cover some area. To cover one UE in one specific area, the gNB transmits and receives signals with the UE using one or more analog beams. The gNB and UE need to determine the beam(s) used for their connection. When a UE moves within one cell coverage area, the beam(s) used for this UE may be changed and switched. These beam management operations were agreed in the 3GPP NR RAN1 meeting as L1 and L2 operations.

In the present invention, a mobility and beam management method for next-generation cellular systems is proposed.

In the present invention, an initial access method for next-generation cellular systems is proposed.

Depending on the network type, the term "base station" or "BS" refers to any component (or set of components) that is configured to provide wireless access to a network, for example a transmit point (TP), a transmit-receive point (TRP). , enhanced base station (eNodeB or eNB or gNB), macrocell, femtocell, WiFi access point (AP) or other wireless capable devices. The base station may include one or more wireless communication protocols, such as 5G 3GPP new air interface/access (interface/access, NR), long term evolution (LTE), LTE-advanced (LTE-A), high speed packet access (HSPA), Wi- It can provide wireless access according to Fi 802.11a/b/g/n/ac, etc. For convenience, the terms “BS” and “TRP” are used interchangeably in this patent specification to refer to a network infrastructure that provides wireless access to remote terminals. Also, depending on the type of network, the term "user equipment" or "UE" may refer to "mobile station", "subscriber station", "remote terminal", "terminal" "wireless terminal", "electronic device", "customer premises equipment" , may be referred to as a “reception point” or “user device”. For convenience, the terms “user equipment” and “UE” refer to wirelessly to a BS, whether the UE is a mobile device (eg, a mobile phone or smart phone) or a generally contemplated stationary device (eg, a desktop computer or a vending machine). It is used herein to refer to a remote wireless device that accesses.

8 illustrates an exemplary high-level initial access and beam association procedure 800 in accordance with embodiments of the present invention. The embodiment of the high-level initial access and beam association procedure 800 shown in FIG. 8 is for illustrative purposes only. One or more of the components shown in FIG. 8 may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

As shown in FIG. 8 , seven steps of a high-level initial access and beam association procedure are performed according to some embodiments of the present invention. In the multi-beam-based approach, beam sweeping is applied to the initial access signal/information up to a certain stage. The UE applies blind decoding to multiple time-frequency resources in a specific period to detect/obtain those signals/channels/information to which beam sweeping is applied. Blind decoding of the UE and beam sweeping of the eNB incur computational complexity and resource overhead, so the use of these mechanisms can be minimized. In this case, information that can be exchanged between the UE and the eNB during initial access phases that rely on beam sweeping may be limited.

For better spectral efficiency information exchange (higher or optimally achievable SINR), the UE needs to be configured (or associated) with a transmit beam for UL/DL data reception. When the UE has a plurality of receive beams, the UE also needs to find an optimal beam pair (ie, transmit beam and receive beam) for data reception.

In some embodiments, the beam configuration is performed at two levels (coarse-beam alignment and fine-beam alignment). Up to step 4 of FIG. 8 , the eNB applies beam sweeping, and no beam is yet associated with the UE. In step 5, the UE transmits a random access channel (RACH) and receives a random access response (RAR). Unlike steps 1-4, RAR is unicast information. In achieving better spectral efficiency, this would be desirable if the unicast information was transmitted purely without relying on a beam sweeping mechanism. One possibility is to perform coarse beam association between the transmit beam and the receive beam, for example, through a special RACH resource selection method.

In one example, the UE measures RSRPs of a plurality of cell specific first level beam measurement reference signal (MRS-1) resources indexed by beam ID and/or beam group ID, and the beam with the strongest RSRP and/or and select the RACH resource based on the beam group ID. In this case, the eNB implicitly obtains at least the coarse beam information (when the beam group ID is used for the RACH resource selection of the UE) for the UE by detecting signals on the RACH resource of the UE. The eNB may transmit the RAR for the UE using the implicitly indicated coarse beam. For data transmission and/or reception with higher spectral efficiency, fine beam association may be required. For this beam configuration, the UE needs to report RSRPs of the selected MRS-1 resources (step 6); A UE may be configured with a (fine) beam index.

9 illustrates an exemplary network node communication 900 within and around the coverage area of a serving cell in accordance with embodiments of the present invention. The embodiment of network node communication 900 shown in FIG. 9 is for illustrative purposes only. One or more of the components shown in FIG. 9 may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

As shown in FIG. 9 , network node communication within and around the coverage area of a serving cell is performed according to some embodiments of the present invention. In a wireless system, a base station (BS) or eNB may use one or more TRPs to cover the entire coverage area of one cell using multiple coverage beams. Each TRP may constitute one or more coverage beams, and one or more TRPs may together constitute a coverage beam.

In some embodiments, the UE is configured to measure the RSRP of a subset of total coverage beams within a cell (represented as a coverage beam group), wherein the coverage beams within this subset are transmitted from a subset of TRPs within one cell. A subset of TRPs may include one TRP, multiple TRPs, or all TRPs. This configuration may be UE specific or cell specific. The subset of TRPs (and coverage beams) that are configured to be measured by the UE may change, for example after the UE moves to a different location within one cell or to another cell.

In this specification, "TRP subset" may indicate "(coverage) beam group" when they are used to configure a subset of beams.

An example in which N _TRP (≧1) TRP is used to cover the coverage area of one cell 901 is shown in FIG. 9 . Each TRP uses one or more coverage beams. The UE 921 is configured to measure coverage beams from the TRP subset 931 , and the UE 922 is configured to measure the TRP subset 932 . TRP subsets 931 and 932 may or may not overlap. The UE may be configured to update the TRP subset to measure RSRP (via RRC signaling). As shown in FIG. 9 , the UE 921 is configured to measure the coverage beam from the TRP subset 931 when the UE is located at the location 991 . After the UE 921 moves to the location 992 , the UE is configured to measure coverage beams from the TRP subset 933 .

In an embodiment, the UE is configured with one or more of the coverage beams transmitted from one or more TRPs, eg, for UL/DL data and control reception. the BS transmits DL signals to the UE using the associated coverage beam(s); The UE uses a receive beam corresponding to coverage beams configured for DL signal reception.

10A illustrates an example of a single beam from a single transmit/receive point (TRP) 1000 according to embodiments of the present invention. The embodiment of a single beam from a single TRP 1000 shown in FIG. 10A is for illustrative purposes only. One or more of the components shown in FIG. 10A may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

Depending on the network topology, the UE may include (1) a single beam from a single TRP as shown in FIG. 10A; and (2) N beams from N TRPs as shown in FIG. 10B .

10B depicts exemplary two coverage beams 1005 in accordance with embodiments of the present invention. The embodiment of the two coverage beams 1005 shown in FIG. 10B is for illustration only. One or more of the components shown in FIG. 10B may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

In an example shown in FIG. 10A , UE1 1021 is configured with one beam 1031 transmitted from TRP1 1011 for UL/DL data and control reception. In addition, the BS may configure the UE1 1021 to measure the RSRP of the coverage beams transmitted from the TRP1 1011 .

In the example shown in FIG. 10B , UE1 1021 is configured with two coverage beams, one beam 1031 from TRP1 1011 and another beam 1032 from TRP2 1012 . Both beams 1031 and 1032 provide a strong signal strength to UE1 1021 . To achieve this, UE1 1021 is configured to apply limited beam RSRP measurements of TRP1 1011 and TRP2 1012 .

10C illustrates another exemplary two coverage beams 1010 according to embodiments of the present invention. The embodiment of the two coverage beams 1010 shown in FIG. 10C is for illustrative purposes only. One or more of the components shown in FIG. 10C may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

In the example shown in FIG. 10C , the UE is configured to associate with coverage beams from two TRPs. UE1 1021 is associated with coverage beam 1031 from TRP1 1011 and coverage beam 1033 from TRP2 1012 . A coverage beam 1031 (eg, a single beam) provides a strong signal strength to UE1 1021 , while a coverage beam 1033 from TRP2 1012 causes a weak signal strength to UE1 1021 . . In this way, the BS uses the beam 1031 to transmit a signal to the UE1 1021 while the BS uses the beam 1033 from the TRP2 1012 to not cause much interference to the UE1 1021. It may serve another UE (eg, UE2 1022 ) while not doing so.

In some embodiments, the UE measures and reports reference signal received power (RSRP) of received beams in consideration of beam grouping. Beam grouping may or may not affect the operation of the UE for RSRP measurement, but changes the UE operation when selecting RSRP report content.

For RSRP measurement, the UE is configured to measure the RSRP of N _total transmission beams for each reception beam of the serving cell by performing measurement on MRS-1. To this end, MRS-1 is transmitted over N _total orthogonal resources within a period, each corresponding to a transmit beam. The MRS-1 resource may correspond to a combination of at least one of a comb index, an OCC code index, a subframe index, an OFDM symbol index, a subband index, and an antenna port number. When the UE has an N _Rx beam, the UE measures N _Rx· N _total RSRP for all combinations of transmit and receive beams. N _total beams are configured by the eNB so that a UE within the coverage area of cell 901 can receive at least one of these beams. The N _total beam may be divided into multiple beam groups, and the beams in these groups are constituted by TRPs of TRP subsets 931 , 932 , 933 as shown in FIG. 9 . Beam grouping information is a higher layer, for example, a system information block (MIB) (step 3 in FIG. 8) or a system information block (SIB) (step 4 in FIG. 8) or RRC configuration (after step 5, For example, in RAR or separate RRC signaling).

At least two methods can be considered for designing beam grouping information signaling and for indexing these N _total beams.

In an embodiment of the first method, N _total beams are indexed by a single beam index (BI) b∈ {0,1,..., N _total -1}. This beam grouping information includes at least: the number of beam groups, N _g ∈{0,1,..., N _g,max -1}, where the beam groups are n∈{0,1,... , N _g -1 }.

If the beam groups have the same number of beams, each beam group will have N _B (= N _total /N _g ) beams; In this case, beam n has N _B,n beams for all n, and N _B,n = N _B . For example, if N _total = 100 and N _g = 5 is configured, each group will have N _B = 20 beams, and group n will be {N _B (n-1), ..., N _B n-1} or equivalent N _B (n-1)+b', where n∈{0,1,...,N _g -1} and b'∈{0,1, ...,N _B }.

.In a more general alternative, the beam grouping information includes an N _g numbered list of beams of beam groups with potentially different numbers of beams in different beam groups: {NB, n}, where

.

In an embodiment of the second method, N _total beams are indexed by the following two indices: beam index (BI) b∈{0,1,..., N _B -1} and beam group index n ∈{0,1,..., N _g -1}, where N _total =N _B N _g , and N _B is a constant. The beam grouping information includes at least: the number of beam groups, N _g ∈{0,1,...,N _g,max -1}, where the beam groups are n∈{0,1,..., Indexed by N _g -1}.

In an embodiment of the third method, N _total beams are indexed by a single beam index (BI) b∈{0,1,...,N _total -1}, and an additional index (scrambling ID, SCID ) is configured to indicate a scrambling sequence for constructing the beam MRS-1. a plurality of MRS-1s having the same beam ID but different scrambling IDs are mapped to the same MRS-1 resource, but different scrambling IDs have different scrambling sequences; Different scrambling IDs are multiplexed in a non-orthogonal manner in the same MRS-1 resource. In this embodiment, the UE is configured with "MRS scrambling ID (SCID) information" indicating the SCIDs used for MRS-1 configuration. When the UE is configured with N _sc scrambling IDs, the UE needs to measure RSRPs of N _sc ·N _total transmit beams per receive beam.

In this embodiment, frequency resources within a cell for MRS-1 transmission can be reused, which is useful for a cell with multiple TP groups covering different geographic areas as shown in FIG. 9 . For example, if the UE is configured with two SCIDs (ie, N _sc = 2), the UE may estimate RSRP from two different TRP groups. The eNB may use RSRP measurement for two TRP groups for beamforming operation between TRP groups.

In some embodiments, the UE determines that (1) beams configured with a first SCID belong to a first beam group; In addition, (2) beams configured with the second SCID belong to the second beam group, and are configured to assume beam RSRP measurement. In these embodiments, the UE assumes that N _g = N _sc and N _B = N _total . The UE is configured to apply these N _sc different scrambling initializations generated by these N _sc scrambling IDs (and also corresponding different scrambling sequences) to measure N _sc ·N _total RSRPs per receive beam. In one example, the scrambling sequence is initialized in the form of (physical cell ID)*2 ^A + SCID, where A is a positive integer. "MRS SCID information" may be configured in MIB (step 3 in FIG. 8), SIB (step 4 in FIG. 8) or be configured in RRC configuration (after step 5, for example in RAR or separate RRC signaling) can

In one example, "MRS SCID information" directly indicates the SCID list of {first SCID, second SCID,..., Nth _sc SCID}. In another example, "MRS SCID information" indicates a list of SCIDs among several candidates: {first SCID}, {first SCID, second SCID}, {first SCID, second SCID, third SCID, Selection of the 4th SCID}. In another method, "MRS SCID information" indicates the number of SCIDs that are 1, 2 or 4 choices. When the UE is configured with one of 1, 2, and 4, the displayed candidate SCIDs are {first SCID}, {first SCID, second SCID} and {first SCID, second SCID, third SCID, respectively; 4th SCID}.

11A illustrates a flowchart of a method 1100 for receiving a control signal and measuring and reporting BIs and beam RSRPs according to embodiments of the present invention, which may be performed by a user equipment (UE). The embodiment of method 1100 shown in FIG. 11A is for illustrative purposes only. One or more of the components shown in FIG. 11A may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

As shown in FIG. 11A , in step 1111 , the UE performs (1) beam grouping information (N _g beam group, where beam group n has N _B,n beams) in the upper layer (RRC); and (2) a beam selection method (PUSCH or PUCCH) for RSRP reporting. In step 1112 , with the received MRS-1, the UE measures the RSRP of the transmit beams per receive beam; If the UE has N _Rx beams, the total number of beam RSRPs will be N _Rx ·N _total (or alternatively N _Rx ·N _total ·N _sc for method 3) for all combinations of transmit and receive beams. In step 1113 , when the UE is triggered to report RSRP, the UE reports the RSRP of the selected beam and the BI of that beam, at least in part according to configurations (1) and (2) as described above.

In some embodiments, the RSRP is periodically reported on the PUCCH. The UE is configured with a subframe period and an offset in a higher layer (RRC), and a PUCCH resource for PUCCH RSRP reporting. In one subframe configured for PUCCH RSRP reporting, the UE selects the beam with the highest RSRP among all beams across all beam groups, and reports in the PUCCH resource (beam group ID, beam ID, corresponding RSRP).

In some embodiments, RSRP reporting is triggered by UL grant downlink control information (DCI). The UE may also dynamically indicate the number of beams per beam group (N _r ) to be included in the PUSCH report in the UL grant DCI or be configured in a higher layer (RRC); Alternatively, N _r is a constant positive integer (eg 2, 4). The UL Grant DCI includes a bit field to indicate whether and how the UE needs to report RSRP. If the state of this bit field is the first state, the UE is configured to transmit data only (no RSRP report) on the scheduled PUSCH. When the state of this bit field is another state, the beam RSRP is reported in the scheduled PUSCH.

In some embodiments, the UE is configured to report N _r N _g RSRPs and N _r N _g BIs in the scheduled PUSCH. The UE is configured to measure the RSRP of the beams in each N _g beam group. After that, the UE determines the largest N _r per beam group Select RSRPs and corresponding BIs for reporting. One method (beam selection configuration (2) in step 1111) is configured in the upper layer to indicate to the UE how to select the N _r largest RSRP beam per beam group for reporting. In one example, when the first method is configured (eg, independent measurement), the N _r largest RSRP beams of one beam group are selected independently of the beams selected for another beam group. This embodiment is useful when the eNB uses a DL transmission technique including a single TRP or DPS for DL data transmission to the UE. The UE is configured to report N _r pairs (beam ID, corresponding RSRP) for each configured beam group (in this case, the UE reports information of N _r N _g pairs), and the beam IDs of each group are the corresponding RSRP are chosen to be one of the N _r optimal beams of the beam group.

In another example, when the second method (eg, receive-beam constraint measurement) is configured, i among one beam group according to the constraint that the same receive beam is used for the i-th largest RSRP beam of another beam group The largest RSRP beam is selected (here, i∈{1,2,..., N _r }). This method is useful when the eNB uses a non-coherent JT or other related CoMP technique that includes multiple TRPs for DL data transmission. In this example, to select the first largest RSRP beam, the UE first selects the first BI with the largest RSRP among all beams across all groups. Then, the UE sends a message other than the first beamgroup to which the first BI belongs, under the constraint that the same receive beam used to derive the optimal RSRP of the first beamgroup is used for beams in each of the other beamgroups. A second BI having an optimal RSRP is selected from among the beams in each of the other beam groups. The i-th largest RSRP beams may be similarly selected. In this example, there are several alternatives for configuring the report content of the receive-beam constraint measurement, the details of which are described below.

In an example of alternative 1 to the second method (receive-beam constraint measurement), the UE is configured to report N _r beam RSRP reports in a scheduled PUSCH, where for each beam RSRP report the UE is N _g beam IDs; It is configured to include one BI per beam group.

가 된다. UE는 내림차순으로 RSPR 합을 정렬하도록 구성된다. i 번째 빔 RSRP 보고를 포함하는 빔들은, 동일한 UE 수신 빔이 보고 내의 모든 빔들에 대해 사용된다는 제약조건에 따라 i 번째로 큰 RSPR 합을 달성한다(여기서, i∈ {1,2,...,N_r}).To construct these reports, the UE is configured to calculate, for each receive beam, the RSPR sum of N _g beams, one beam per beam group. In this case, the total number of RSPR agreements is

becomes The UE is configured to sort the RSPR sum in descending order. The beams containing the i-th beam RSRP report achieve the i-th largest RSPR sum according to the constraint that the same UE receive beam is used for all beams in the report (where i∈ {1,2,... ,N _r }).

In one embodiment, each beam RSRP report includes {first beam ID, second beam ID, ..., N _g beam ID, RSPR sum}, where j-th beam ID is the j-th configured beam group (j∈ {1,2,..., N _g }); RSPR sum is the sum of RSRPs corresponding to the reported beam.

In one embodiment, the beams containing the i-th report achieve the i-th largest RSPR sum, and this also means that the RSRP of all beams according to the constraint that the same UE receive beam is used for all beams is the first beam RSRP threshold. A condition larger than γ _b1 is also satisfied. The value of the beam RSRP threshold γ _b1 may be configured in a higher layer for the UE.

In an example of alternative 2, the UE (1) selects the largest RSRP beam from some of the configured beam groups (indicated by N _{g, serving} serving beam groups) and (2) reports RSRP in the scheduled PUSCH The remainder of the beam groups configured for (N _g,companion is configured to select the smallest RSRP beam from the companion beam groups). Here, N _g = N _g,serving + N _g,companion . For this purpose, the UE may be configured in a higher layer with information elements indicating which beam group is a serving group and which beam group is a companion group. Alternatively, the UE may be configured in a higher layer with an information element indicating which beam group is a companion group; In this case, the remaining beam groups are serving groups.

및

이 된다. UE는 제 1 타입 RSPR 합들을 내림차순으로 정렬하며; 또한 제 2 타입 RSPR 합들을 오름차순으로 정렬하도록 구성된다. 이러한 UE 구현예가 도 11b에 도시되어 있다.To construct these reports, the UE (1) for each receive beam, one beam per serving beam group, N _g,serving First type RSPR sum of beams, (2) for each receive beam, one beam per companion beam group, N _g,companion and calculate a second type RSPR sum of beams. In this case, the total number of the sum of the first type RSPR and the sum of the second type RSPR is respectively

and

becomes this The UE sorts the first type RSPR sums in descending order; It is also configured to sort the second type RSPR sums in ascending order. Such a UE implementation is shown in FIG. 11B .

11B illustrates exemplary serving and companion beam groups 1150 in accordance with embodiments of the present invention. The embodiment of serving and companion beam groups 1150 shown in FIG. 11B is for illustration only. One or more of the components shown in FIG. 11B may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

The UE is configured with N _g,serving = 2 serving beam groups and N _g,companion = 2 companion beam groups. The UE sorts the first and second type RSPR sums for serving and companion beam groups in descending order and ascending order, respectively. The largest first type RSPR sum is achieved with beams b ₀ , b ₁₀ and receive beam x; The second largest first type RSPR sum is achieved with beams b ₁ , b ₁₁ and receive beam y; Others are like this. The smallest second type RSPR sum is achieved with beams b ₂₀ , b ₃₀ and receive beam s; The second smallest type RSPR sum is achieved with beams b ₂₁ , b ₃₁ and receive beam t; Others are like this.

보다 크다는 조건을 만족시키며; 또한 이들 빔들은 모든 UE 빔들에 대하여 동일한 UE 수신 빔들이 사용된다는 제약조건에 따라 선택된다(여기서, i∈{1, 2, ...,N_r}).In one embodiment, the UE is configured to report N _r beam RSRP reports in the scheduled PUSCH, for each beam RSRP report, the UE includes N _g beam IDs; It is configured to include one BI per beam group. The beams containing the i-th beam RSRP report are selected according to: The beams selected from the serving groups achieve the i-th largest RSPR sum (across all combinations of transmit and receive beam pairs) and (i∈{1, 2, ..., N _r }); In the beams selected from the companion groups, the difference between the RSPR sum of the beams selected from the serving group and the RSPR sum of the beams selected from the companion beams is an RSRP offset threshold.

greater than the condition is satisfied; Also, these beams are selected according to the constraint that the same UE receive beams are used for all UE beams (here, i∈{1, 2, ...,N _r }).

의 값은 UE에 대하여 상위 계층에서 정보 요소로 구성될 수 있다. 일 예에서, i 번째 빔 RSRP 보고를 포함하는 빔들은 서빙 그룹으로부터 빔들의 i 번째로 큰 RSPR 합을 달성하고, 또한 동일한 UE 수신 빔들이 모든 빔들에 대해 사용된다는 제약조건에 따라, 서빙 그룹으로부터 선택된 빔들의 RSPR 합이 제 1 RSPR 합 임계치

보다 크며 컴패니언 그룹으로부터 선택된 빔들의 RSPR 합이 제 2 RSPR 합 임계치

보다 작다는 조건을 만족시킨다(여기서, i∈ {1, 2, ..., N_r}). RSPR 합 임계치들

및

의 값은 UE에 대하여 상위 계층에서 정보 요소로 구성될 수 있다.RSRP Offset Threshold

The value of may be configured as an information element in a higher layer for the UE. In one example, the beams containing the i-th beam RSRP report achieve the i-th largest RSPR sum of beams from the serving group, and are also selected from the serving group according to the constraint that the same UE receive beams are used for all beams. The RSPR sum of the beams is the first RSPR sum threshold

The RSPR sum of beams greater than and selected from the companion group is the second RSPR sum threshold.

less than (here, i∈ {1, 2, ..., N _r }). RSPR Sum Thresholds

and

The value of may be configured as an information element in a higher layer for the UE.

In one example, each beam RSRP report includes {first beam ID, second beam ID, ..., N _g beam ID, RSPR sum of serving groups}, where j-th beam ID is the j-th configured selected from a group of beams (j∈{1, 2, ...,N _g }); The RSPR sum of the serving groups is the sum of the RSRPs corresponding to the beams reported in the serving groups.

보다 크고, (2)다른 N_g-N_S 빔 그룹들로부터 선택된(이 빔 조합을 위한 컴패니언 빔 그룹들로서 선택된) 빔들의 RSPR 합이 제 2 RSPR 합 임계치

보다 작다는 조건을 만족한다(여기서, i∈ {1,2, ...,N_r}).In one implementation, the network configures for the UE the number of beam groups that can be used by the UE as a serving group. The value of N _S , the number of serving groups, is configured for the UE via a higher layer message. The UE is configured to report N _r beam RSRP reports in the scheduled PUSCH, for each beam RSRP report, the UE includes N _g beam IDs; It is configured to include one BI per beam group. According to the constraint that the beams including the i-th beam RSRP report use the same UE reception beams for all beams, (1) the RSPR sum of beams selected from N _S beam groups is the first RSPR sum threshold.

(2) the RSPR sum of beams selected from other N _g -N _S beam groups (selected as companion beam groups for this beam combination) is the second RSPR sum threshold

less than (here, i∈ {1,2, ...,N _r }).

보다 크다는 조건을 만족시킨다(여기서, i∈{1,2,...,N_r}).In one example, the beams containing the i-th beam RSRP report may achieve the i-th largest RSPR sum selected from the N _S beam groups among the N _g configured beam groups, and the same receive beams are used for all beams. According to the constraint, the RSPR sum of beams selected from these N _S beam groups and the RSPR sum of beams selected from other N _g -N _S beam groups are the RSRP offset threshold.

greater than (here, i∈{1,2,...,N _r }).

In another example, each beam RSRP report includes {first beam ID, second beam ID, ..., N _g beam ID, bitmap of beam group, RSPR sum of serving groups}, where jth The beam ID is selected from the j-th configured beam group (j∈{1,2,...,N _g }); In addition, the bitmap of the beam group is an N _g bit field, bit #1 corresponds to the first configured beam group, bit #2 corresponds to the second configured beam group, and bit #N _g corresponds to the N _g configured beam group. do. A value of one bit indicates whether a corresponding beam group is used as a serving group or a companion group. The RSPR sum of the serving groups is the sum of the RSRPs corresponding to the beams reported in the serving groups.

In one embodiment, the UE is configured to report the receive beam capability to the BS. In one example, the UE uses a bit to indicate to the BS whether the UE has only one receive beam or beam sweeps through multiple receive beams. If the bit indicates that the UE is performing beam sweeping, the BS configures the UE to measure RSRP by assuming that the same receive beam is used.

In one embodiment, a mapping between the value of the RSRP index and the measured quantity of RSRP is defined. Table 1 shows an example. The UE is configured to convert the measured RSRP amount into an RSRP index and report the RSRP index in RSRP reporting.

[Table 1] Example of mapping

An embodiment of the present invention considers transmission beam management for PDCCH and PDSCH transmission. Transmission beams used for PDCCH transmission and PDSCH transmission may be different. Accordingly, the UE may include: (1) a beam used for PDCCH transmission; and (2) a beam used for PDSCH transmission.

Transmission of the PDCCH and the PDSCH generally uses different transmission schemes. For example, the PDCCH may use several transmit diversity schemes, and for example, SFBC and PDSCH may use a spatial multiplexing scheme or a network MIMO scheme. Optimal beams corresponding to different transmission schemes may be different. In this way, the eNB may use different beams for PDCCH and PDSCH transmissions.

12 is a flowchart illustrating a physical downlink control channel (PDCCH) decoding method 1200 according to embodiments of the present invention, which may be performed by a UE. The embodiment of method 1200 shown in FIG. 12 is for illustrative purposes only. One or more of the components shown in FIG. 12 may be implemented in special circuitry configured to perform the recited functions or one or more components may be implemented by one or more processors executing instructions to perform the recited functions. . Other embodiments may be used without departing from the scope of the present invention.

In an embodiment, the BS signals the transmit beam(s) used for PDCCH transmission to the UE, and the BS signals the transmit beam(s) used for PDSCH transmission to the UE. The UE receives the PDCCH according to the transmission beam configuration from the BS, and the UE decodes the PDCCH to obtain scheduling information of the PDSCH. Then, the UE is configured to decode the PDSCH according to the transmission beam configuration for the PDSCH and the scheduling information in the PDCCH. An example is shown in FIG. 12 . As shown in FIG. 12 , in procedure 1200 , the BS first indicates the transmit beam configuration for PDCCH to the UE in 1211 . The BS indicates to the UE the transmit beam configuration for the PDSCH at 1212 . The UE is configured to decode the PDCCH according to the transmit beam configuration for the PDCCH at 1213 . And then the UE is configured to decode the PDSCH according to the transmission beam configuration for the PDSCH and the scheduling information in the PDCCH at 1214 .

The BS indicates to the UE the information transmission beam(s) used for PDCCH transmission, via higher layer signaling (eg, RRC), MAC signaling or physical layer signaling (eg, DCI of PDCCH). The information that the BS signals to the UE to indicate the transmission beams used for the PDCCH may be one of the following: one beam index; a plurality of beam indexes; one beam index and one beam group index; a plurality of sets of {beam index, beam group index}; and an index for one item of beam information report.

In one method, the BS signals the information of the transmission beam for the PDCCH and the subframe timing information k to the UE. The UE is configured to receive the PDCCH with this configured transmit beam(s) starting in subframe n+k when the UE receives its configuration in subframe n.

The BS may indicate information on transmission beams used for PDSCH transmission to the UE through higher layer signaling (eg, RRC), MAC signaling or physical layer signaling (eg, DCI of PDCCH). The information that the BS signals to the UE to indicate the transmission beams used for the PDSCH may be one of the following: one beam index; a plurality of beam indexes; one beam index and one beam group index; a plurality of sets of {beam index, beam group index}; Index for one item of beam information report.

In one method, the BS signals the information of the transmission beam for the PDSCH and the subframe timing information (1) to the UE. The UE is configured to receive the PDSCH with this configured transmit beam(s) starting at subframe n+1 when receiving the configuration in subframe n.

In one method, the BS configures the beam(s) for PDSCH transmission via a hybrid method. Information on a set of transmission beam(s) from which the BS selects one beam for PDSCH transmission is signaled through higher layer signaling or MAC signaling. Thereafter, the BS may use the bit field in the PDCCH to indicate to the UE the transmit beam used for the PDSCH. In one example, the BS configures two optional transmission beams for the UE, and the BS uses a 1-bit field in the PDCCH to indicate the transmission beam used for PDSCH transmission. In another example, the BS configures a set of four optional transmission beams for the UE, and the BS uses a 2-bit field to indicate a transmission beam used for PDSCH transmission. In another example, the BS configures a set of 8 optional transmission beams for the UE, and the BS uses a 3-bit field to indicate a transmission beam used for PDSCH transmission.

In an embodiment, the BS configures a transmission beam for the PDSCH through DCI in the PDCCH scheduling the PDSCH allocation. DCI may explicitly include information on transmission beam(s) used for PDSCH allocation and scheduling information for PDSCH allocation. In one method, UE-common DCI in one subframe may configure the transmit beam(s) used for all PDSCH assignments in one subframe.

In an embodiment, type information of one DCI configures transmission beam(s) for the PDSCH. If the DCI type is one of several specific types, the PDSCH is configured to be transmitted on the same beam as the PDCCH. If the DCI type is one of several specific types, the PDSCH is configured to be transmitted in beams that may be explicitly indicated in DCI or other signaling using the methods described above.

The present invention contemplates indicating to the UE a receive beam for downlink transmission of PDCCH and PDSCH. In this way, instead of indicating the transmit beam, the BS configures a receive beam that the UE can use for reception of the PDCCH and PDSCH.

13 is a flowchart of a method 1300 for decoding a physical downlink shared channel (PDSCH) according to embodiments of the present invention. The embodiment of method 1300 shown in FIG. 13 is for illustrative purposes only. One or more of the components shown in FIG. 13 may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

In an embodiment, the BS signals a reception beam used for PDCCH transmission to the UE, and the BS signals a reception beam used for PDSCH transmission to the UE. The UE receives the PDCCH according to the reception beam configuration from the BS, and the UE decodes the PDCCH to obtain scheduling information of the PDSCH. Then, the UE is configured to decode the PDSCH according to the receive beam configuration for the PDSCH and the scheduling information in the PDCCH. An example is shown in FIG. 13 . As shown in FIG. 13 , in procedure 1300 , the BS first indicates to the UE the receive beam configuration for the PDCCH in 1311 . The BS indicates to the UE the receive beam configuration for the PDSCH at 1312 . The UE is configured to decode the PDCCH according to the receive beam configuration for the PDCCH at 1313 . And the UE is configured to decode the PDSCH according to the reception beam configuration for the PDSCH and scheduling information in the PDCCH at 1314 .

The above-described embodiments for configuring transmission beams for PDCCH and PDSCH may be used to configure reception beam configuration for PDCCH and PDSCH by simple extension here. Detailed descriptions of the receive beam configuration have been omitted for simplicity.

In some embodiments, a beam measurement configuration is contemplated. A set of MRS antenna ports corresponds to a beam, and a beam set corresponds to one beam group. These groups of beams and MRS configurations are referred to as beam group configurations.

In some embodiments, the UE obtains downlink and uplink synchronization and establishes an RRC connection with the eNB. The maximum number of BRSs that can be configured is N _b,max Assume they are beams. N _{b, max} Beams may be distinguished in time or frequency or both, for example by transmitting different time instants or frequency domains. In one example, transmitting different beams in a time instant is transmitting in different OFDM symbols. One example of transmitting different beams in the frequency domain is to use different RE offsets for different beams. In another example, transmitting different beams in the frequency domain is using an orthogonal covering code among the different beams. In this specification, beam and beam reference signal (BRS) are used interchangeably.

In one example, in the beam group configuration, the beams are partitioned into O groups, where group 0 includes beams {0 ... floor(N _b,max /O)} and group 1 includes {floor(N _{b ) ,max} /O) ... 2Хfloor(N _b,max /O)}, ..., beam group O-1 is {(O-1)Хfloor(N _b,max /O) ... N _b,max }. The network needs to signal the value of 0 to the UE. One method is explicit signaling through some bits of DCI, RRC, MIB or SIB to indicate the number of beam groups. An example is given in Table 2. As shown in Table 2, the number of beams in a beam group is indicated by the state of the 2-bit field. The bit field may be included in a DCI or RRC signaling message or MIB/SIB.

[Table 2] First example of beam group display

In some embodiments, the number of beam groups is signaled implicitly. The eNB implicitly indicates the beam group to which the BRS belongs by applying a beam group specific scrambling sequence. For example, BRSs are generated according to a pseudo-random sequence initialized by C _init , where C _init = f(n _g ) + values (values do not depend on group ID), n _g is group ID, G _t = 0...0 _t -1, and f(˙) is a predefined linear or non-linear It is a function.

In one example, beams may be grouped in the following ways. O groups are mapped to the following beams: beam group O contains beams {0:O:N _b,max },..., beam group O-1 is beams {O-1:O:N _{b ,max} }.

In some embodiments, the eNB may signal the corresponding characteristics of the O groups to the UE. One exemplary characteristic is that a beam selected from one beam group may be transmitted in the same OFDM symbol as another beam selected from a different beam group. In one example, the number of beam groups having this characteristic is denoted by O _t . Another example is that a UE may assume that a beam selected from one beam group has a different spatial correlation with a beam selected from a different beam group and a beam selected from the same group. In one example, the number 0 of beam groups having this property is denoted by O _s .

In one example, the eNB explicitly or implicitly configures the beam group into a beam group associated with a single characteristic. In an exemplary explicit configuration, the number of sets of beams in a beamgroup is indicated by the state of the transmitted bit field. The bit field indication may be transmitted by being included in a DCI or RRC signaling message or MIB/SIB.

[Table 3] Second example of beam group display

In an example of implicit configuration, the eNB implicitly configures the indication of the beam group to which the BRS belongs by applying different beam group-specific scrambling sequences to beams transmitted in different groups. For example, the reference signals of the BRS are generated according to a pseudo-random sequence initialized by C _init , where C _init = f(G _t n _g ) + a value independent of the group ID, n _g G _t is the group ID, G _t = 0...0 _t -1, where f(˙) is a predefined linear or non-linear It is a function.

In general, the beams may be correlated in space. One example is that if two beams are formed to face two distinct directions, they are unlikely to be used simultaneously. Another example is that when two beams are formed to face two adjacent directions, they are more likely to have similar BRSRPs. By exploring such a correlation, feedback overhead can be reduced. Splitting the beams into one or more spatial groups serves as one way to explore this correlation. It also facilitates the eNB and UE to maintain various beams that can be used for eg combat blockage, coordinated transmission, high rank transmission. One example would be that if there are multiple paths the two clusters could come from two different angles, each angle being captured by one beam group and efficiently selected within each group.

In some embodiments, O _s is configured to indicate a grouping between beams. Several methods of mapping beams to groups are described. In a first alternative, O _s groups are mapped to the following beams: group 0 {0 ... floor(N _b,max /O _s )}, ..., group O _s -1 {(O _s - 1)floor(N _b,max /O _s )+1...N _b,max }. In a second alternative, O _s groups are mapped to beams as follows: group 0 {0:O _s :N _b,max }, ..., group O _s -1 {O _s -1:O _s :N _b,max }. In one example, two adjacent beams may have very close spatial correlation. When the first alternative is used, beams belonging to the same group have less correlation. When the second alternative is used, beams belonging to different groups have less correlation.

In some embodiments, the eNB may configure beam groups having two or more characteristics through signaling of O _t and O _s . In a first alternative: a bitmap is used to represent both values simultaneously. These indications may be transmitted via DCI or RRC signaling.

[Table 4] 3rd example of beam group display

, 그룹 1

,..., 그룹 O_sO_t-1

일 수 있다. 다른 예에서, eNB는 상이한 그룹들에서 송신되는 빔들에 대해 상이한 스크램블링 시퀀스를 적용함으로써 빔 그룹의 표시를 암시적으로 구성한다. 예를 들어, BRS의 기준 신호들이 C_init에 의해 초기화되는 의사 랜덤 시퀀스에 따라 생성되며, 여기서 C_init = f(G_t,s) + 그룹 ID에 의존하지 않는 값이고, G_t,s는 그룹 ID이고, 0≤G_t,s≤O_tO_s-1이며, f(˙)는 사전 정의된 선형 또는 비선형 함수이다.In one example, the mapping between O _t and O _s beam indices is group O

, group 1

,..., group O _s O _t -1

can be In another example, the eNB implicitly configures the indication of a beam group by applying different scrambling sequences for beams transmitted in different groups. For example, the reference signals of the BRS are generated according to a pseudo-random sequence initialized by C _init , where C _init = f(G _t,s ) + value independent of group ID, G _t,s is group ID, 0≤G _t,s ≤O _t O _s -1, where f(˙) is a predefined linear or a non-linear function.

In some embodiments, an eNB may have a single TXRU connecting to an array, where these beams are formed via analog beamforming, for example. In a second example operation, the eNB may have K TXRUs, each of which connects to the array. Two basic scenarios can be considered. The grouping parameter O _t may be related to K, for example O _t =K.

In some embodiments, each of the TXRUs may transmit a different set of beams, eg, TXRU 0 transmits beam {0 ... floor(N _b,max /O _t )}, ... , TXRU O _t -1 transmits {(O _t -1)floor(N _b,max /O _t )+1...N _b,max }. In this case, beams transmitted in different TXRUs may be used simultaneously for data or control, but beams transmitted in the same TXRUs may or may not be used simultaneously for data or control (similar to the first example) .

In some embodiments, all TXRUs transmit the same set of beams, eg beam {0 ... N _b,max -1}.

In some embodiments, flexible beam grouping in which one beam group configuration includes _NG beam groups numbered as n _G = 1, ..., _NG is considered. In each beam group n _G , N _B (n _G ) beams are configured. N _P (n _B ,n _G ) antenna ports are configured for one beam n _B of the beam group n _G . The transmission and configuration of the beam by the eNB is dynamic and indicated by the eNB via DL control signaling in the physical layer.

In some embodiments, a set of beam groups in which the beam group configuration includes, for example, at least one of a group index or group identification (ID), group characteristics, beam indexes associated with a group, or port indexes associated with a beam. Higher layer signaling is used to configure the UE. An example of a group configuration is shown in Table 5. A group of up to 8 beams may be indicated via 3 bits, and for one group, 3 features may be associated with or without 3 bits (eg "1" means that a feature is associated and , "0" means not). Beam indices belonging to a group are represented by 6 bits by selecting one of 64 different beam combinations. Port indexes belonging to a beam or a beam group are indicated by 4 bits.

[Table 5] Example of beam group configuration

The UE may be configured with multiple beam groups, and the indication of the group may be dynamically indicated by a bit field in DCI, an example of which is shown in Table 6.

[Table 6] Example of group configuration display

In the case of beam and CSI reporting, it is advantageous for the UE to be aware of these beam transmission constraints, which are covered by the following embodiments. The eNB may configure the UE to feed back a BSI report, or a CSI report, or a joint BSI and CSI report. During the beam measurement procedure, since the eNB may select different beamforming weights for transmitting CSI-RS other than the weights used for transmitting BRS, performing BSI reporting that does not depend on CSI considerations results in subsequent CSI-RS Transmission flexibility is provided. On the other hand, in some circumstances, joint feedback on BSI and CSI may allow the UE to select BIs more suitable for subsequent data transmission, because to use a BI selection procedure in which possible transmission schemes can be considered. because it can In some embodiments, the eNB configures 1 bit for the UE to indicate whether a BSI report or a joint BSI/CSI report is requested through DCI or RRC signaling, as shown in Table 7 .

[Table 7] Example of feedback reporting configuration for BSI and joint BSI/CSI

In an embodiment, one beam group configuration includes _NG beam groups numbered as n _G = 1,..., _NG . In each beam group n _G , N _B (n _G ) beams are configured. Also, in the case of the n _B -th beam of the beam group n _G , N _P (n _B ,n _G ) antenna ports are configured. Transmission and configuration of at least one of beam, port and beam group is dynamically or semi-statically configured or indicated by the eNB via DL control signaling or higher layer signaling.

The UE may be configured with joint BSI and CSI reporting or configured with separate BSI and CSI reporting to support various modes of operation.

In some embodiments of the present invention, one UE is configured with several measurement modes for measurement of a plurality of beam groups. In one example, there are two measurement modes. One mode is a constrained measurement mode and one mode is an unconstrained measurement mode. The configuration of the measurement mode may be signaled through a bit field in a DCI or RRC message. One example is that bit=1 configures the constrained measurement mode and bit=0 configures the unconstrained measurement mode. Another example is that the presence of the one bit field indicates that the constrained measurement mode is configured, and the absence of the one bit field indicates that the non-constrained measurement mode is configured.

In one example, one UE is configured to perform joint measurement on a plurality of beam groups when the constrained measurement mode is configured. In one implementation, the UE may measure the BRSRP sum of the transmit beam combinations by selecting one beam from all beam groups and one receive beam, after which the UE reports the beam combination with the strongest BRSRP sum to the eNB.

In one example, one UE is configured to perform non-joint measurement on a plurality of beam groups when the non-constrained measurement mode is configured. In one implementation, the UE may measure the BRSRP of all beams and all receive beams, after which the UE reports the beams with the strongest BRSRP of each beam group.

In some embodiments, the UE selects a subset of preferred BIs as well as jointly computes the CSI report. In one example, the joint CSI reporting includes at least one of CQI, PMI, RI, BI and BRSRP as shown in Table 8, wherein CQI and PMI may be subband or wideband and RI, BI and BRSRP are broadband am.

[Table 8] Example of joint CSI and BSI reporting

14 illustrates an exemplary joint beam state information (BSI) and channel state information (CSI) report 1400 according to embodiments of the present invention. The embodiment of the joint BSI and CSI report 1400 shown in FIG. 14 is for illustrative purposes only. One or more of the components shown in FIG. 14 may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

The UE calculates the CQI, PMI and RI subject to possible combinations of BIs as shown in FIG. 14 .

In some embodiments, the UE is configured for maximum rank v transmission. The UE may select up to v beams from the hypothesis of CSI calculation, where each beam corresponds to a BRS port, that is, {p _brs +biSelected(0),...,p _brs +biSelected(v-1)}. Here, biSelected includes integer indices such that p _brs +biSelected(i) corresponds to the BRS port of the selected beam i. To simplify the notation, let {p _brs +biSelected(0),...,p _brs +biSelected(v-1)} be denoted as {p _brs,0 ,...,p _{brs,v - 1} } .

In some embodiments, the CQI is defined as follows: Based on an unrestricted observation interval in time and frequency, the UE, for each CQI value reported in uplink subframe n, a beam index corresponding to the CQI index The highest CQI index that satisfies the condition of a single PDSCH transport block having a combination of selection, modulation scheme, and transport block size can be derived, or when CQI index 1 does not satisfy this condition, CQI index 0 can be derived. and occupying a group of downlink physical resource blocks referred to as CSI reference resources, may be received with a transport block error probability not exceeding 0.1.

여기서

는 계층 맵핑으로부터의 심볼들의 벡터이며, W(i)는 x(i)에 적용 가능한 보고 PMI에 대응하는 프리코딩 매트릭스이다.In some embodiments, when the UE is configured for PMI/RI reporting, the UE assumes that the overhead matches the most recently reported rank; The PDSCH signals on the antenna ports {p _d,0 ,...,p _{d,v -1} } for the v layers are as given by the antenna ports {p _brs,0 ,...,p _brs Signals equal to the corresponding symbols transmitted in _{,v - 1} } are obtained:

here

is a vector of symbols from the layer mapping, and W(i) is the precoding matrix corresponding to the reporting PMI applicable to x(i).

In some embodiments, multiple alternatives for selecting a BI hypothesis are described. In general _{, a valid} combination _{of BIs} satisfies group, where 0≤G t≤O _t -1 and _{0≤v≤O t -1} .

15 illustrates an exemplary beam index (BI) selection 1500 based on a threshold in accordance with embodiments of the present invention. The embodiment of the beam index (BI) selection 1500 shown in FIG. 15 is for illustrative purposes only. One or more of the components shown in FIG. 15 may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

In one example, all valid combinations of beam/BI/BRS, ie the number of BIs, may be less than or equal to the maximum rank configuration for the UE, and is selected for BI hypothesis testing in CSI calculation. In another example, as shown in FIG. 15 , only BIs with BRSRP exceeding the threshold are considered in the hypothesis test. Among these BIs, all valid combinations of beam/BI/BRS are selected for BI hypothesis testing in CSI calculation.

In some embodiments, multiple methods may be used to determine the threshold. In one example, single and quasi-static thresholds are configured by the eNB via higher layer signaling. In another example, the threshold is calculated by the UE based on the maximum BRSRP or average BRSRP of all BIs or based on the BRSRP of some selected BIs. In one example, the threshold is set to m% of the maximum BRSRP. In another example, the threshold is set to m% of the average BRSP for the selected BIs.

16 illustrates an exemplary BI selection 1600 based on grouping and threshold in accordance with embodiments of the present invention. The embodiment of the BI selection 1600 shown in FIG. 16 is for illustrative purposes only. One or more of the components shown in FIG. 16 may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

In some embodiments, both BI grouping and thresholding are applied. The set of beams (BIs) is divided into one or more groups. The UE first selects a subset of BIs, where: (1) for each group, the UE selects an optimal beam with a BRSRP exceeding a threshold; (2) For each group, the UE selects the optimal N beams. All valid combinations of selected BIs are then used for CSI reporting hypothesis testing.

In some embodiments, when the UE is configured with separate BSI and CSI reporting, the UE selects a subset of preferred BIs and subsequently calculates the CSI report. In one example, the BSI includes BIs with a corresponding BRSRP value over a BRSRP and PUSCH that exceeds a threshold. In another example, the BSI and CSI reports are jointly calculated using at least one embodiment described in the foregoing embodiments, but are calculated using only the feedback BSI report. After receiving the BSI report, the eNB may transmit the CSI-RS and trigger the CSI report.

In some embodiments, feedback overhead reduction is described. After the initial BSI report, the eNB and the UE may select a subset of beams whose beam directions are suitable for transmitting or receiving signals with each other. The subset of beams selected does not change rapidly over time. In addition, the BRSRP values may not deviate significantly from each other; Otherwise, beam(s) of very small BRSRP compared to other beams may be removed from the selected subset. These characteristics are considered and used by the following embodiments to reduce the BSI feedback overhead.

In one example, the eNB configured a subset of the beams to allow the UE to track the beams. The UE calculates a sequential BSI report for a subset of the selected beams. The eNB to UE indication of the subset of beams may be sent via RRC signaling or higher layer signaling.

In another example, the UE tracks beams suitable for transmission/reception and reports the offset with respect to the initially selected BIs. This offset may be dynamically signaled by DCI or semi-statically configured by higher layer signaling.

In another example, the BRSRP value of the first beam is reported using the full range, and if more than one beam is reported, BSRSP values for the other beams are calculated separately for the optimal beam. In one example, the BRSRP index and corresponding value of the first beam are given in Tables 9 and 10.

[Table 9] BRSRP index table for the first beam

[Table 10] BRSRP index table for non-first beam

In some embodiments, a “receive mode” is defined as a set of UE receive analog beams. That is, it is defined as a UE receive operation using a set of UE receive analog beams (including the special case of one analog beam). "Reception mode (Rx mode)" is a reception mode (receive mode), a reception beam mode (RX beam mode), a reception mode for beam management (beam management), reception beam, reception beam ID, reception pattern, reception beam pattern, It may be referred to as a receive beam combination, a receive beam group, a receive beam set, a receive beam selection, a receive antenna port, and spatial channel characteristics. The name “receiving mode” is exemplary, and may be replaced with another name or label within the scope of not changing the contents of the present embodiment.

17A illustrates an exemplary receive (Rx) mode 1700 of a UE according to embodiments of the present invention. The embodiment of the reception mode 1700 shown in FIG. 17A is for illustrative purposes only. One or more of the components shown in FIG. 17A may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

The definition and mechanism of the reception mode are useful for UE reception operation based on hybrid beamforming. A UE with hybrid beamforming may form one or more analog beams for each receive antenna panel, and these beams may indicate different directions. The gNB and the UE must select one of these beams for optimal link quality between the gNB and the UE. Transmissions between the gNB and the UE, including for example the Downlink Control Channel (PDCCH), are received by some UE's reception scheme in which the Downlink Data Channel (PDSCH) uses these selected beams. Changing the beam selection changes the UE reception and link quality. An example of a receive mode is shown in Fig. 17A. As shown in FIG. 17A , the UE 1710 communicates with the gNB 1705 . The UE 1710 has two receive antenna panels 1750 , 1740 which may be two antenna element arrays connected to two different receive chains. On the antenna panel 1750 , the UE may form four analog beams 1720 pointing in different directions or different beam widths. On the antenna panel 1740 , the UE may form four analog beams 1760 pointing in different directions or different beam widths. Analog beams formed on the same antenna panel cannot be used simultaneously. However, the UE can use any two beams formed on two antenna panels simultaneously.

In the example of FIG. 17A , the UE selects one beam from among 1720 and one beam from 1760 to receive a downlink transmission from the gNB 1705 . The UE may also select only one beam from 1720 or only one beam from 1760 to receive the downlink transmission from gNB 1705 . Selection of two beams, that is, selection of one beam among 1700 and one beam among 1760 may be referred to as one reception mode. In the example shown in FIG. 17A , there may be up to 16 reception modes in total in UE 1710 by selecting beams from both 1720 and 1760 . The gNB 100 and the UE 1710 may perform beam measurements for all of these 16 reception modes. Also, the reception mode may include selecting only one beam from all panels, and in this case, a total of 16+8=24 reception modes exist. The UE may select one reception mode to receive the downlink transmission from the gNB 1705 . In this example, UE 1710 selects a receive mode with analog beams 1701 and 1730 to receive signals from gNB 1705 . The implementation of the receive mode depends on the implementation of the UE. In the example of FIG. 17A , the UE implements one reception mode with two beams selected from two antenna panels. For a UE having one receiving antenna panel, one receiving mode may be only one beam formed in the corresponding antenna panel.

17B illustrates another exemplary receive (Rx) mode 1780 of a UE according to embodiments of the present invention. The embodiment of the receive (Rx) mode 1780 shown in FIG. 17B is for illustrative purposes only. One or more of the components shown in FIG. 17B may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

As shown in FIG. 17B , the UE 1710 includes one antenna panel 1750 , on which four analog beams 1720 having different directions may be formed. The reception mode corresponds to one beam selection. As shown in Fig. 17B, selection of the analog beam 1701 is one reception mode.

여기서,

는 j 번째 안테나 패널 또는 안테나 어레이로부터 선택된 하나의 빔이 있다.In the general example of a UE with N _RX antenna panels, one reception mode of the UE may be implemented as a selection of one beam set as follows:

here,

There is one beam selected from the j-th antenna panel or antenna array.

In some embodiments, the UE is configured to report the configuration of reception modes or UE capability to the network. UE signaling may be UE capability signaling/reporting. The configuration information of the reception mode may include at least one or more of the following. In one example, the configuration information includes multiple reception modes. In this example, the configuration information may be a number of reception modes that the UE may want to measure or may measure through a beam management procedure, and may use one or more of them to receive a downlink transmission. In another example, the configuration information may be an ID of each reception mode. In another example, the configuration information may be spatial relationship information between several reception modes.

In this example, the UE may implement to use different reception modes to cover different directions of arrival. This is useful for mitigating signal interference around the UE. Information of different reception modes covering different directions may be useful for the gNB (eg, assisting the gNB to select the TRP transmit beam(s)). In one example, the gNB may select one or more TRP transmit beam(s) that are preferred for two UE reception modes covering different directions of arrival.

In this example, this information is the value of the spatial correlation between the two reception modes. In one method, one bit of information can be used as an indication of spatial correlation. For example, if 1 bit is 0, it means two reception modes (or with weak spatial correlation) indicating different directions, and if 1 bit is 1, it means two reception modes (or strong spatial correlation) indicating similar directions. means).

In this example, this information may be a grouping of receive modes. The UE may indicate that these reception modes are divided into one or more groups. In one method, reception modes from different groups indicate different directions (or have weak spatial correlations) but reception modes from the same group indicate similar directions (or have strong spatial correlations). In another way, the reception modes in each group indicate different directions (or have weak spatial correlation).

In this example, this information may be indicated implicitly via the ID of the reception modes. In one example, the ID of the reception modes is {1, 2 ,..., N _RM }. The spatial correlation information between the reception modes is expressed as a difference |ij| of two reception mode IDs, where i and j are IDs of the two reception modes. A larger value of |ij| may indicate that the spatial correlation between the arrival directions indicated by the two reception modes may be lower. In this example (eg information about the priority of these reception modes), the UE may indicate to the gNB which reception mode(s) it prefers to use. Such information can help the gNB to configure beam measurement reference signal transmission and measurement. In one example, the gNB may configure the UE to measure and report beam state information regarding the reception mode with high priority.

In some embodiments, the gNB may configure and reconfigure the reception mode(s) for the UE. The purpose of the receive mode(s) configuration may be to measure and/or receive downlink control/data transmission. In one example, the gNB may instruct the UE to change the number of reception modes. In another example, the gNB may instruct the UE not to use one or more reception modes. In another example, the gNB may instruct the UE to change the priority of the reception mode.

In some embodiments, the UE may indicate to the gNB that the configuration of reception modes has been updated and report the updates to the gNB. The configuration of reception modes may be signaled by higher layer signaling (eg, RRC message) or MAC-CE or L1 message.

The configuration of the receive mode is useful in a 5G wireless system. The 5G system in the mmWave frequency band is a multi-beam-based system. Both gNB and UE will be hybrid beamforming and multi-beam based systems. Beam management procedure, beam state information measurement and reporting, and beam indication mechanism are essential functions of the 5G system. The configuration of the receive mode is a very useful and essential function in relation to the operations on the beam.

The UE must select one of these reception modes to receive the downlink transmission. To enable selection, the gNB needs to configure the UE to measure and report beam state information (BSI) for one or more reception modes. Based on this measurement and reporting, the gNB and/or UE may decide to select a reception mode. The gNB may indicate a reception mode that the UE may use to receive one or more physical downlink channels. In one example, the gNB may indicate one reception mode for the PDCCH channel and another reception mode for the PDSCH channel. The gNB may also configure the UE to cycle through multiple reception modes on one particular physical channel. In one example, the gNB may configure the UE to cycle through reception modes over an OFDM symbol set to receive the PDCCH. In this way, some beam direction diversity can be achieved, which is advantageous for preventing signal interference in the mmWave frequency band.

18 shows a flowchart of a method for receive mode operation 1800 according to embodiments of the present invention, which may be performed by a UE. The embodiment of the receive mode operation 1800 shown in FIG. 18 is for illustrative purposes only. One or more of the components shown in FIG. 18 may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

An example of the procedure of the reception mode (Rx mode) is shown in FIG. 18 . As shown in FIG. 18 , the UE first reports information of reception modes at 1810 . The information of reception modes may include the number of reception modes, ID of reception modes, spatial relation information, and priority of reception modes, as described above. Then at 1820 , the gNB may configure the UE to perform measurement based on some reception modes. This measurement and reporting configuration may include information of reception modes that may be applied by the UE at the time of measurement. Measurement to be performed by the UE may be, for example, beam-specific RSRP measurement, RRM (radio resource management) measurement, CSI measurement.

After the measurement, the UE reports the measurement result to the gNB as configured at 1830 . Based on the report from the UE, at 1840 the gNB may configure receive mode(s) for the UE, and the UE is configured to receive the downlink transmission using the indicated receive mode(s). The UE may update the measurement based on the measurement configuration at 1850 , and report this updated measurement to the gNB, which then sets the updated receive mode(s) for the UE for downlink transmission at 1860 make up

18 , in step 1, the UE reports the receive mode capability. In step 2, the gNB configures the UE to perform a measurement (RRM or CSI), the measurement configuration including the reception mode(s) to be applied by the UE for the measurement. In step 3, the UE reports a measurement for each reception mode according to the measurement configuration. In step 4, the gNB configures the reception mode(s) to the UE to receive DL transmissions (physical channels). In step 5, the UE updates the measurement report for the reception modes. In step 6, the gNB reconfigures the reception mode according to the updated measurement report.

In an embodiment, the information of the reception mode of the UE may be implicitly reported to the gNB. In one embodiment, the UE reports the number of repetitions for the TRP transmit beam in the reference signal used by the UE for measurement. In an example of CSI-RS used for beam management, one CSI-RS resource may have a plurality of time units and each time unit may have a plurality of sub-time units. When the transmit beams are swept through time units, the transmit beams may be repeated through sub-time units within one time unit. The UE may report the number of sub-time units requested for the CSI-RS resource to be configured to the UE for beam management measurement and reporting. If the transmit beams are swept over sub time units but are repeated over time units, the UE may report the number of time units requested in the CSI-RS resource to be configured for the UE for beam measurement and reporting. Based on the UE report, the gNB may implicitly know the information of the reception mode.

In the multi-beam-based 5G radio system, the gNB and the UE need to select TRP transmit beam(s) and UE receive beam(s) to be used for transmission of a downlink channel including PDCCH and PDSCH. To aid in beam selection, the gNB may transmit some downlink reference signals regarding beam management. Examples of downlink reference signals for beam management include NR-SSS, beam reference signal (BRS), beam measurement reference signal or beam management reference signal (BMRS), measurement reference signal (MRS), mobility reference signal (MRS) and / or CSI-RS. By measuring the downlink reference signal, the UE can not only measure the quality of the TRP transmission beam, but also select the TRP transmission beam and reception mode for downlink physical channel transmission and reception by measuring the quality of the reception beam, that is, the reception mode. can assist

The beam state information may be RSRP of one reference signal resource, assuming that the UE receives this reference signal resource using one reception mode. This reference signal resource may correspond to one TRP transmit beam that can be identified by a beam ID. The beam ID of one TRP transmission beam is, for example, a reference signal resource, a reference signal port, an OFDM symbol index in the reference signal, a reference signal cyclic shift (CS), a combination of a reference signal port and an OFDM symbol index, and/or It can be identified by an ID of a combination of a reference signal port, an OFDM symbol index, and a slot index.

In some embodiments, one or more TRP transmit beam IDs and one or more RX modes may be signaled to the UE, and the UE may be configured to measure and report beam state information for the configured TRP transmit beam and configured receive modes. The configuration of the reception mode for the UE to measure and report beam state information based on one specific reference signal for beam management is higher layer signaling (eg, RRC message) and/or L2 signaling (eg, MAC -CE) and/or L1 signaling (eg, DCI).

There are several different methods for the UE to measure and report beam state information using TRP transmit beams and receive modes. A few examples are listed here and are detailed in the sections below.

In some embodiments, the UE is configured to measure/report the beam state information of one particular TRP transmit beam measured for multiple configured reception modes. In some embodiments, the UE is configured to measure/report the beam state information of one specific TRP transmission beam measured for all reception modes it can select. In some embodiments, the UE is configured to measure/report the beam state information of one specific TRP transmit beam for one indicated reception mode.

In some embodiments, the UE is configured to measure and report beam state information of all TRP transmission beams measured for one or more configured reception modes. In some embodiments, the UE is configured to measure and report beam state information of one or more TRP transmit beam-receive mode pairs indicated by the network. In some embodiments, the UE is configured to measure and report beam state information of one or more TRP transmission beams measured with respect to one particular reception mode indicated by the network. In some embodiments, the UE is configured to measure and report beam state information based on one or more configured TRP transmit beams and one or more configured receive modes.

In some embodiments, the UE is configured to measure and report beam state information of one or more configured TRP transmit beams that are measured for all receive beams that can be selected by the UE. In some embodiments, the UE is configured to measure all TRP transmit beams and all receive modes to measure and report beam state information.

In some embodiments, the UE may be configured to measure and report beam state information of one TRP transmit beam and one UE receive mode; The UE is configured with TRP transmit beam and receive mode for this purpose. In these embodiments, the UE is configured to measure the RSRP of the reference signal resource corresponding to the configured TRP transmit beam using the configured receive mode. This method is useful for gNB and UE to monitor the beam link quality of one specific pair of TRP transmit beam and receive mode; For example, the gNB may configure the UE to measure the beam link quality of the new pair of TRP transmit beams and receive mode to determine whether to switch to this new beam pair for downlink transmission. In one example, the gNB may configure the UE to measure and report beam state information based on a measurement reference signal that may carry multiple TRP transmission beams (eg, cell specific RS for beam management). The measurement and reporting configuration signaled to the UE includes information of one TRP transmission beam ID; Or it may include one or more of one reception mode ID. In another example, the gNB may configure the UE to report beam state information based on the UE measuring some reference signal that carries only one TRP transmit beam (eg, UE specific CSI-RS for beam management). can In this case, the measurement and reporting configuration to the UE may include only one receive mode ID (TRP transmit beam ID configuration is not required).

}로 구성된다. 그 다음 UE는 이러한 수신 모드들 {R₁,R₂,...,

}의 각각에 대해 이 기준 신호 리소스를 수신하는 것으로 가정함으로써 (송신 빔 B_송신에 대응하는) 기준 신호 리소스의 RSRP를 측정하도록 구성된다. UE는 각각의 표시된 수신 모드에 대응하는 N_R 빔 RSRP를 얻을 수 있다. UE는 빔 상태 정보에서 모든 N_R 빔 RSRP들을 보고하도록 구성될 수 있다. 대안적으로, UE는 가장 큰 1≤N_report≤N_R RSRP 및 이들 가장 큰 RSRP를 생성하는 대응 수신 모드 ID들을 보고하도록 구성될 수 있다. 이 방법은 gNB 및 UE가 하나의 특정 TRP 송신 빔에 대한 수신 모드들의 선택을 개선하는데 유용하다. 일 예에서, gNB는 다수의 TRP 송신 빔들(예를 들면, 빔 관리를 위한 셀 특정 RS)을 전달할 수 있는 측정 기준 신호에 기초하여 빔 상태 정보를 보고하도록 UE를 구성할 수 있다. UE로 시그널링된 측정 및 보고 구성은 하나의 TRP 송신 빔 ID의 정보; 구성된 수신 모드의 수, N_R; 또는 대안적으로는 수신 모드 ID들의 세트 {R₁,R₂,...,

} 중의 하나 이상을 포함할 수 있다. 구성된 수신 모드의 수 N_R이 구성될 경우, 수신 모드 ID들의 세트는 {0, 1, ..., N_R-1}이 되거나; 또는 보고할 빔의 수 RSRP 수는 N_report이 된다. 다른 예에서, gNB는 UE가 하나의 TRP 송신 빔(예를 들면, 빔 관리를 위한 UE 특정 CSI-RS)만을 전달하는 몇몇 기준 신호를 측정하는 것에 기초하여 빔 상태 정보를 보고하도록 UE를 구성할 수 있다. 이러한 경우에, UE로의 측정 및 보고 구성은 수신 모드 ID들의 세트 {R₁,R₂,...,

} 및 구성된 수신 모드의 수 N_R 및 보고된 빔 RSRP의 수 N_report를 포함할 수 있다.In some embodiments, the UE may be configured to measure and report one TRP transmit beam and beam state information of a set of indicated UE receive modes. In such embodiments, one TRP transmit beam and a set of UE receive modes are indicated to the UE. Then, the UE measures the RSRP of the reference signal resource corresponding to the indicated TRP transmit beam ID by assuming that it uses each indicated receive mode in the set of configured receive modes. In one example, the UE sets one transmit beam ID B _transmit and N _R receive mode IDs {R ₁ ,R ₂ ,...,

}. The UE then sets these reception modes {R ₁ ,R ₂ ,...,

} is configured to measure the RSRP of the reference signal resource (corresponding to the transmit beam B _transmission ) by assuming that this reference signal resource is received for each. The UE may obtain the NR beam _RSRP corresponding to each indicated reception mode. The UE may be configured to report all NR beam _RSRPs in the beam state information. Alternatively, the UE may be configured to report the largest 1 ≤ N _report ≤ N _R RSRP and the corresponding reception mode IDs that generate these largest RSRPs. This method is useful for gNB and UE to improve the selection of receive modes for one specific TRP transmit beam. In one example, the gNB may configure the UE to report beam state information based on a measurement reference signal that may carry multiple TRP transmission beams (eg, cell specific RS for beam management). The measurement and reporting configuration signaled to the UE includes information of one TRP transmission beam ID; number of configured receive modes, N _R ; or alternatively a set of receive mode IDs {R ₁ ,R ₂ ,...,

} can be included. When the number of configured reception modes N _R is configured, the set of reception mode IDs becomes {0, 1, ..., N _R -1}; Alternatively, the number of beams to report RSRP is N _report . In another example, the gNB may configure the UE to report beam state information based on the UE measuring several reference signals carrying only one TRP transmit beam (eg, UE specific CSI-RS for beam management). can In this case, the measurement and reporting configuration to the UE is a set of receive mode IDs {R ₁ ,R ₂ ,...,

} and the number of configured reception modes N _R and the number of reported beam RSRPs N _report .

}를 결정할 수 있다. 그 다음 UE는 세트 {R₁,R₂,...,

} 내의 수신 모드 각각을 사용하여 가정함으로써 이 기준 신호 리소스의 N_R 빔 RSRP를 계산한다. UE는 가장 큰 N_report≥1 RSRP 및 대응하는 수신 모드 ID를 보고하도록 구성될 수 있다. 일 예에서, gNB는 다수의 TRP 송신 빔들(예를 들면, 빔 관리를 위한 셀 특정 RS)을 전달할 수 있는 측정 기준 신호에 기초하여 빔 상태 정보를 보고하도록 UE를 구성할 수 있다. UE로 시그널링된 측정 및 보고 구성은 하나의 TRP 송신 빔 ID의 정보; 보고할 빔 RSRP 수, N_report; 또는 UE가 수신 모드를 자체적으로 선택하도록 표시하는 1 비트 정보 중 하나 이상을 포함할 수 있다. 이 1 비트 정보는 구성 시그널링에서 수신 모드 정보의 부존재에 의해서 암시적으로 표시될 수 있다. 이 1 비트 정보는 명시적으로 시그널링될 수도 있다. 다른 예에서, gNB는 단 하나의 TRP 송신 빔을 전달하는 측정 기준 신호에 기초하여 빔 상태 정보를 보고하도록 UE를 구성할 수 있다. 이 예에서, UE로의 측정 및 보고 구성은 보고되는 빔 RSRP의 수, N_report 및 UE가 수신 모드를 자체적으로 선택하도록 표시하는 1 비트 정보를 포함할 수 있다.In some embodiments, the UE may be configured to measure and report the beam state information of one TRP transmit beam and the UE is configured to use all available reception modes. In these embodiments, the UE is configured to measure the RSRP of the reference signal resource corresponding to the indicated TRP transmission beam. The UE is configured to select each of all reception mode(s) for receiving this reference signal resource and calculate the RSRP. For example, the UE is a set of N _R reception mode IDs { _{R 1} ,R ₂ ,...,

} can be determined. Then the UE sets {R ₁ ,R ₂ ,...,

} calculates the NR beam _RSRP of this reference signal resource by assuming using each of the receive modes in . The UE may be configured to report the largest N _report ≥ 1 RSRP and the corresponding reception mode ID. In one example, the gNB may configure the UE to report beam state information based on a measurement reference signal that may carry multiple TRP transmission beams (eg, cell specific RS for beam management). The measurement and reporting configuration signaled to the UE includes information of one TRP transmission beam ID; Beam RSRP number to report, N _report ; or one or more of 1-bit information indicating that the UE selects the reception mode by itself. This 1-bit information may be implicitly indicated by the absence of reception mode information in configuration signaling. This 1-bit information may be explicitly signaled. In another example, the gNB may configure the UE to report beam state information based on a measurement reference signal carrying only one TRP transmit beam. In this example, the measurement and reporting configuration to the UE may include the number of beam RSRPs reported, N _report , and 1-bit information indicating that the UE selects the reception mode by itself.

}로 구성될 수 있다. UE는 구성된 세트 {R₁,R₂,...,

} 내의 각 수신 모드로 빔 관리(예를 들면, BRS, BMRS 또는 CSI-RS)를 위한 기준 신호의 모든 기준 신호 리소스들의 RSRP를 측정하도록 구성될 수 있다. 그 다음, 각각의 표시된 수신 모드에 대해, UE는 상이한 TRP 송신 빔들에 대응하는 다수의 RSRP를 얻을 수 있다. UE는 다음 중 하나 이상을 보고하도록 구성될 수 있다: 세트 {R₁,R₂,...,

} 내의 각각의 표시된 수신 모드에 대해, UE는 가장 큰 RSRP 및 대응하는 TRP 송신 빔 ID를 보고하며; UE는 구성된 세트 {R₁,R₂,...,

} 내의 수신 모드들과 TRP 송신 빔의 모든 조합들의 모든 RSRP 중에서 가장 큰 N_report≥1 RSRP를 보고한다. UE는 또한 각각의 보고된 RSRP에 대해 구성된 수신 모드 세트 {R₁,R₂,...,

} 내의 대응하는 수신 모드 및 대응하는 TRP 송신 빔 ID 보고할 수 있다. UE로 시그널링되는 빔 측정 및 보고 구성은 빔 측정 및 보고에 사용되는 기준 신호(리소스들)의 아이덴티(들); 구성된 수신 모드의 수, N_R; 또는 대안적으로는 구성된 수신 모드의 세트 {R₁,R₂,...,

} 중의 하나 이상을 포함할 수 있다. 구성된 수신 모드의 수 N_R이 구성될 경우, 수신 모드 ID들의 세트는 {0, 1, ..., N_R-1}이 된다. 빔 RSRP의 수는 보고 모드에서 N_report으로 보고된다.In some embodiments, the UE may be configured to measure and report beam state information in one or more indicated reception modes. In such embodiments, the UE may select one or more reception modes {R ₁ ,R ₂ ,...,

} can be configured. The UE has a configured set {R ₁ ,R ₂ ,...,

} may be configured to measure the RSRP of all reference signal resources of a reference signal for beam management (eg, BRS, BMRS or CSI-RS) with each reception mode in the . Then, for each indicated reception mode, the UE may obtain multiple RSRPs corresponding to different TRP transmission beams. The UE may be configured to report one or more of the following: set {R ₁ ,R ₂ ,...,

} for each indicated reception mode, the UE reports the largest RSRP and the corresponding TRP transmission beam ID; The UE has a configured set {R ₁ ,R ₂ ,...,

} Reports the largest N _report ≥ 1 RSRP among all RSRPs of all combinations of reception modes and TRP transmission beams in . The UE also receives the configured receive mode set {R ₁ ,R ₂ ,...,

} in the corresponding reception mode and the corresponding TRP transmission beam ID may be reported. The beam measurement and reporting configuration signaled to the UE includes: identity(s) of reference signals (resources) used for beam measurement and reporting; number of configured receive modes, N _R ; or alternatively a set of configured reception modes {R ₁ ,R ₂ ,...,

} can be included. When the number of configured reception modes N _R is configured, the set of reception mode IDs becomes {0, 1, ..., N _R -1}. The number of beam RSRPs is reported as N _report in the report mode.

In some embodiments, the UE may be configured to measure and report beam state information for a pair of one or more TRP transmit beams and UE receive modes indicated by the network. In these embodiments, the UE may be configured with one or more TRP transmit beam-receive mode pairs S _i ={B _TX,i ,R _i }. The UE is configured to measure the RSRP of the reference signal resource corresponding to each transmit beam ID B _TX,i by assuming that it receives this reference signal resource using the associated reception mode R _i in the indicated pair. The UE may be configured to report the N _report ≥ 1 largest beam RSRPs and the indices of the transmit-receive pair generating each RSRP. This method is useful when the gNB wants to monitor several specific transmit-receive beam pairs, and if disturbed, the gNB can switch to one of the monitored transmit-receive beam pairs. The measurement and reporting configuration signaled to the UE includes: TRP transmit beam ID and receive mode ID S _i ={B _TX,i ,R _i } of one or more transmit-receive pairs; The number of beam RSRPs to report may include N _report .

} 및 하나의 수신 모드 R₁로 구성될 수 있다. UE는 구성된 수신 모드 R₁을 사용하여 각 기준 신호 리소스를 수신하는 것으로 가정하여 구성된 세트 {B_TX,1,B_TX,2,...,

} 내의 각 TRP 송신 빔에 대응하는 기준 신호 리소스의 RSRP를 측정하도록 구성된다. UE는 구성된 TRP 송신 빔들에 대한 총 M_TX 빔 RSRP를 얻는다. UE는 이러한 모든 M_TX 빔 RSRP를 네트워크에 보고하도록 구성될 수 있다. UE는 가장 큰 N_report≥1 RSRP 및 대응하는 TRP 송신 빔 ID를 보고하도록 구성될 수 있다. 이 방법은 gNB 및 UE가 하나의 특정 수신 모드에 대한 TRP 송신 빔의 선택을 개선하는데 유용하다. gNB는 빔 상태 정보 보고에 기초하여 특정 수신 모드에 가장 적합한 TRP 송신 빔을 선택할 수 있다. gNB는 또한 수신 모드를 변경하도록 UE에 지시하는 것 없이도 빔 상태 정보 보고에 기초하여 TRP 송신 빔 스위칭 및 변경을 결정할 수 있다. 측정 및 보고 구성은 다음 중 하나 이상을 포함할 수 있다: TRP 송신 빔 ID들의 서브세트 {B_TX,1,B_TX,2,...,

}; 하나의 UE 수신 모드 R₁; 및 보고할 빔 RSRP 수, N_report.In some embodiments, the UE may be configured to measure and report beam state information of multiple TRP transmission beams received in one particular reception mode indicated by the network. In these embodiments, the UE transmits M _TX TRP transmit beams {B _TX,1 ,B _TX,2 ,...,

} and one reception mode R ₁ . A set {B _TX,1 ,B _TX,2 ,..., configured assuming that the UE receives each reference signal resource using the configured reception mode R ₁

} is configured to measure the RSRP of the reference signal resource corresponding to each TRP transmission beam in the. The UE gets the total M _TX beam RSRP for the configured TRP transmit beams. The UE may be configured to report all these M _TX beam RSRPs to the network. The UE may be configured to report the largest N _report ≥ 1 RSRP and the corresponding TRP transmit beam ID. This method is useful for gNB and UE to improve the selection of the TRP transmit beam for one specific reception mode. The gNB may select a TRP transmission beam most suitable for a specific reception mode based on the beam state information report. The gNB may also determine TRP transmit beam switching and change based on the beam state information report without instructing the UE to change the reception mode. The measurement and reporting configuration may include one or more of the following: a subset of TRP transmit beam IDs {B _TX,1 ,B _TX,2 ,...,

}; One UE reception mode R ₁ ; and the number of beam RSRPs to report, N _report .

} 및 UE 수신 모드의 서브세트 {R₁,R₂,...,

}가 UE에게 표시된다. UE는 표시된 수신 모드 서브세트 {R₁,R₂,...,

} 내의 수신 모드 각각을 사용하여 {B_TX,1,B_TX,2,...,

} 내의 각 TRP 송신 빔에 대응하는 기준 신호 리소스의 RSRP를 측정할 수 있다. UE는 구성된 TRP 송신 빔들 각각과 구성된 수신 모드들 각각 사이의 모든 조합에 대한 총

×

RSRP들을 얻을 수 있다. UE는 다음 중 하나 이상을 보고할 수 있다. 일 예에서, 세트 {R₁,R₂,...,

} 내의 각각의 표시된 수신 모드에 대해, UE는 {B_TX,1,B_TX,2,...,

} 내의 가장 큰 RSRP 및 대응하는 TRP 송신 빔 ID를 보고한다. 다른 예에서, 세트 {B_TX,1,B_TX,2,...,

} 내의 각각의 표시된 송신 모드에 대해, UE는 표시된 세트 {R1, R2,...} 내의 가장 큰 RSRP 및 대응하는 UE 수신 모드를 보고한다. 또 다른 예에서, UE는 서브세트 {B_TX,1,B_TX,2,...,

} 내의 TRP 송신 빔과 구성된 세트 {R₁,R₂,...,

} 내의 수신 모드들의 모든 조합들의 모든 RSRP들 중 가장 큰 N_report≥1 RSRP를 보고한다. UE는 또한 각각의 보고된 RSRP에 대해 구성된 수신 모드 세트 {R₁,R₂,...,

} 내의 대응 수신 모드 및 대응 TRP 송신 빔 ID를 보고할 수 있다.In some embodiments, the UE may be configured to measure and report beam state information using one or more indicated TRP transmit beam IDs and one or more indicated UE reception modes. Subset of TRP transmit beams {B _TX,1 ,B _TX,2 ,...,

} and a subset of UE reception modes {R ₁ ,R ₂ ,...,

} is indicated to the UE. The UE indicates the received mode subset {R ₁ ,R ₂ ,...,

} using each of the receive modes in {B _TX,1 ,B _TX,2 ,...,

} can measure the RSRP of the reference signal resource corresponding to each TRP transmission beam in the. The UE determines the total for all combinations between each of the configured TRP transmit beams and each of the configured receive modes.

×

RSRPs can be obtained. The UE may report one or more of the following: In one example, the set {R ₁ ,R ₂ ,...,

} for each indicated reception mode in the UE, {B _TX,1 ,B _TX,2 ,...,

} and report the largest RSRP and the corresponding TRP transmit beam ID. In another example, the set {B _TX,1 ,B _TX,2 ,...,

} for each indicated transmission mode, the UE reports the largest RSRP in the indicated set {R1, R2,...} and the corresponding UE reception mode. In another example, the UE sets the subset {B _TX,1 ,B _TX,2 ,...,

} with TRP transmit beams in the set {R ₁ ,R ₂ ,...,

} Report the largest N _report ≥1 RSRP among all RSRPs of all combinations of reception modes in . The UE also receives the configured receive mode set {R ₁ ,R ₂ ,...,

} in the corresponding reception mode and the corresponding TRP transmission beam ID may be reported.

}; 구성된 수신 모드들의 수, N_R(또는 대안적으로 구성된 수신 모드의 세트 {R₁,R₂,...,

}), 구성된 수신 모드들의 수 N_R가 구성될 경우, 수신 모드 ID들의 세트는 {0, 1, ..., N_R-1}가 됨; 보고 모드의 정보(예를 들면, 모든 RSRP 보고 또는 가장 큰 RSRP 보고); 및 보고된 빔 RSRP의 수, N_report.The above-described embodiments are useful for gNB and UE to align transmit and receive beams between subsets of transmit and receive beams. The UE may be configured to report beam state information of all combinations of each configured TRP transmit beam and each configured receive mode. The UE may be configured to report the largest N _report ≥ 1 RSRPs and the corresponding TRP transmit beam and the corresponding UE reception mode. The measurement and reporting configuration may include one or more of the following: a subset of TRP transmit beam IDs {B _TX,1 ,B _TX,2 ,...,

}; Number of configured reception modes, N _R (or alternatively set of configured reception modes {R ₁ ,R ₂ ,...,

}), when the number of configured reception modes N _R is configured, the set of reception mode IDs becomes {0, 1, ..., N _R -1}; information of the reporting mode (eg, all RSRP reports or largest RSRP reports); and the number of reported beam RSRPs, N _report .

}가 UE에 표시된다. UE는 모든 수신 모드 각각을 사용하여 {B_TX,1,B_TX,2,...,

} 내의 각 TRP 송신 빔에 대응하는 기준 신호 리소스의 RSRP를 측정할 수 있다. UE는 구성된 TRP 송신 빔들 각각과 수신 모드들 각각 사이의 모든 조합들에 대한 총

×R_Rx RSRP들을 얻을 수 있으며, 여기서, R_Rx는 모든 수신 모드들의 총 수이다. UE는 다음 중 적어도 하나를 보고할 수 있다. 일 예에서, 세트 {B_TX,1,B_TX,2,...,

} 내의 각 표시된 송신 모드에 대해, UE는 가장 큰 RSRP 및 대응하는 UE 수신 모드를 보고한다. 다른 예에서, UE는 서브세트 {B_TX,1,B_TX,2,...,

} 내의 TRP 송신 빔과 수신 모드들의 모든 조합의 모든 RSRP 중에서 가장 큰 N_report≥1 RSRP를 보고한다. UE는 또한 각각의 보고된 RSRP에 대한 대응 수신 모드 및 대응 TRP 송신 빔 ID를 보고할 수 있다. 전술한 실시 예들은 gNB 및 UE가 송신 빔들의 서브세트 사이에서 TRP 송신 빔들을 개선하는데 유용하다. gNB는 모든 UE 수신 모드들을 통해 몇 개의 송신 빔을 개선한 다음 최적의 송신 빔들을 선택할 수 있다. 측정 및 보고 구성은 다음 중 하나 이상을 포함할 수 있다: TRP 송신 빔 ID들의 서브세트 {B_TX,1,B_TX,2,...,

}; 보고 모드의 정보(예를 들면, 모든 RSRP 보고 또는 가장 큰 RSRP 보고); 및 보고된 빔 RSRP의 수, N_report.In some embodiments, the UE may be configured to measure and report beam state information based on measuring one or more configured TRP transmit beams and all UE reception modes. Subset of TRP transmit beams {B _TX,1 ,B _TX,2 ,...,

} is displayed on the UE. The UE uses each of all receive modes {B _TX,1 ,B _TX,2 ,...,

} can measure the RSRP of the reference signal resource corresponding to each TRP transmission beam in the. The UE determines the total for all combinations between each of the configured TRP transmit beams and each of the receive modes.

XR _Rx RSRPs may be obtained, where R _Rx is the total number of all receive modes. The UE may report at least one of the following. In one example, the set {B _TX,1 ,B _TX,2 ,...,

} for each indicated transmission mode, the UE reports the largest RSRP and the corresponding UE reception mode. In another example, the UE sets the subset {B _TX,1 ,B _TX,2 ,...,

} reports the largest N _report ≥ 1 RSRP among all RSRPs of all combinations of TRP transmit beams and receive modes. The UE may also report the corresponding reception mode and corresponding TRP transmit beam ID for each reported RSRP. The above-described embodiments are useful for gNB and UE to improve TRP transmit beams between a subset of transmit beams. The gNB may improve several transmit beams over all UE receive modes and then select the optimal transmit beams. The measurement and reporting configuration may include one or more of the following: a subset of TRP transmit beam IDs {B _TX,1 ,B _TX,2 ,...,

}; information of the reporting mode (eg, all RSRP reports or largest RSRP reports); and the number of reported beam RSRPs, N _report .

In some embodiments, the UE may be configured to measure and report beam state information based on measuring all TRP transmit beams and all UE receive modes. In such embodiments, the UE may be configured to use each of all reception modes to receive and measure the RSRP of each of the reference signal resources in the reference signal configured for beam management. In this way, the UE can obtain the RSRP of each TRP transmit beam and the beam pair of each receive mode. The UE may be configured to report one or more of the following: all TRP transmit beams and all RSRPs of the receive mode pair; Largest RSRP among all TRP transmit beams (e.g., a UE may measure the RSRP of one TRP transmit beam for multiple receive modes and the UE is configured to report the largest RSRP for each TRP transmit beam ); The largest N _report of the largest RSRP among all TRP transmission beams; the largest RSRP of all receive modes (eg, the UE may measure the RSRP of multiple TRP transmit beams for one receive mode and the UE is configured to report the largest RSRP of each receive mode); The largest N _report among the largest RSRPs of all reception modes. The above-described embodiments are useful for the gNB and the UE to measure all transmit beams and all receive beams to obtain initial beam alignment.

In a multi-beam-based system, the UE needs to know which reception mode (or reception beam) to use to receive a downlink transmission including a PDCCH and a PDSCH. In some embodiments, one or more reception modes that may be used for downlink transmission, reception of PDCCH and/or PDSCH are signaled to the UE. Reception modes may be signaled implicitly or explicitly. Reception modes may be signaled via higher layer signaling (eg, RRC message), MAC-CE and/or L1 signaling (eg, DCI). In one example, the gNB signals one reception mode to the UE and configures the UE to use this configured reception mode to receive one downlink channel. Signaling may include: ID of reception mode; slot offset information, a slot index at which the UE can start using the indicated reception mode; and information about the downlink channel to which the UE can apply the indicated reception mode. In one example, the gNB may indicate to the UE that one reception mode is used for PDCCH reception. The gNB may indicate to the UE that one reception mode may be used for PDSCH reception. The gNB may indicate one reception mode that the UE may use for reception of both PDCCH and PDSCH.

In one example, the reception mode is signaled implicitly, and the UE may use a reception mode corresponding to one specific RSRP reported in a beam state information report for reception of a PDCCH and/or a PDSCH. In one example, in the beam measurement and reporting configuration, the gNB may indicate to the UE that the UE may use a reception mode corresponding to the first RSRP report for downlink reception. Channel information, eg, PDCCH and/or PDSCH, may be signaled in a measurement and report configuration message.

19 shows a flowchart of a method 1900 for beam management according to embodiments of the present invention, which may be performed by a UE. The embodiment of a flow chart of method 1900 shown in FIG. 19 is for illustrative purposes only. One or more of the components shown in FIG. 19 may be implemented in special circuitry configured to perform the recited functions, or one or more of these components may be implemented by one or more processors executing instructions to perform the recited functions. can be implemented. Other embodiments may be used without departing from the scope of the present invention.

As shown in FIG. 19 , the method 1900 for beam management begins at step 1910 . In step 1910 , the UE receives from a base station (BS) a group of at least two transmit beams including transmit (Tx) signals generated from different antenna panels. In some embodiments, each transmit beam of the group of at least two transmit beams each corresponds to a different antenna panel. In some embodiments, each beam of the group of at least two transmit beams is received in the same OFDM symbol. In some embodiments, the UE receives transmit signals included in the group of at least two transmit beams from at least two transmit and receive points (TRPs) each including a plurality of panels, in operation 1920 .

Then, in step 1910, a group of at least two transmit beams is transmitted via reference signals (RSs) from the BS. The UE receives configuration information from the BS in step 1920 . The configuration information includes a selection constraint for a group of at least two transmit beams.

The UE then measures at least one transmit beam from each group of the at least two transmit beams in step 1930 . In step 1930, beam measurement is performed based on the configuration information received from the BS in step 1920 . In some embodiments, the UE measures a group of at least two transmit beams based on the configuration information in step 1930 .

Next, the UE selects the same receive beam set as the receive beam in step 1940 . The receive beam corresponds to each of the measured beams. In some embodiments, the receive beam set includes at least one receive beam corresponding to at least one antenna panel or antenna array. Specifically, the selection in step 1940 is performed for each of at least two groups of transmit beams. In some embodiments, the UE selects at least one beam from at least two groups of transmit beams based on a selection constraint configured by at least one of the network elements in step 1940 .

Finally, the UE transmits a report message including information on the selected transmission beams and information on the same selected reception beam set corresponding to the reception beam in step 1950 . In some embodiments, the UE generates, in step 1950 , information related to each group of at least two transmission beams based on the configuration information received from the BS, and a report message including information of each group of the at least two transmission beams. to send In some embodiments, this information includes transmission signals of different quality respectively corresponding to a serving group and a companion group. In some embodiments, the UE transmits a report message including information of transmission signals related to at least one TRP, in step 1950 . In such embodiments, joint transmission (JT), dynamic point selection (DPS), or interference coordination is applied to at least two TRPs.

According to various embodiments, there is provided a method of a user equipment (UE) for beam management in a wireless communication system, the method comprising at least transmit (Tx) signals generated from different antenna panels from a base station (BS). A configuration comprising: receiving a group of two transmit beams, the group of at least two transmit beams being transmitted via reference signals; and a selection constraint on the group of at least two transmit beams. receiving information from the BS; measuring at least one transmit beam from a group of at least two transmit beams based on the configuration information; and selecting at least one transmit beam from each of the group of at least two transmit beams. and selecting the same reception beam set as the reception beam corresponding to each of the selected transmission beams, and transmitting a report message including information on the selected transmission beams and the selected reception beam set corresponding to the reception beam to the BS. includes

According to various embodiments, the method includes selecting at least one transmission beam from each of a group of at least two transmission beams based on a selection constraint configured by a base station, and at least two transmission beams based on configuration information received from the BS. The method further includes generating information related to each of the groups of transmission beams, and transmitting a report message including information on each of the groups of at least two transmission beams.

According to various embodiments, the information includes qualities of different transmission signals respectively corresponding to each group of the at least two transmission beams.

According to various embodiments, each transmit beam of the group of at least two transmit beams respectively corresponds to a different antenna panel, and each beam of the group of at least two transmit beams is received in the same orthogonal frequency division multiplexing (OFDM) symbol. do.

According to various embodiments, the reception beam set includes at least one reception beam corresponding to at least one antenna panel or an antenna array.

According to various embodiments, the method includes receiving transmission signals included in a group of at least two transmission beams from at least two transmission/reception points (TRPs) each including a plurality of panels; specifying a group of two transmission beams; and transmitting a report message including information of transmission signals related to at least one TRP.

According to various embodiments, at least one of joint transmission (JT), dynamic point selection (DPS), or interference coordination is applied to the at least two TRPs.

Although the present disclosure has been described as an exemplary embodiment, various changes and modifications may be suggested to those skilled in the art. It is intended that this disclosure cover such changes and modifications as fall within the scope of the appended claims.

Claims (32)

A method of operating a user equipment (UE) in a wireless communication system, the method comprising:
A process of receiving configuration information about a CSI (channel state information) report from a base station through radio resource control (RRC), and the configuration information is a signal that can be simultaneously received by the terminal including beam selection information and beam grouping information for configuring the terminal to report at least two beams of
identifying a first transmission beam of the base station and a second transmission beam of the base station based on the beam selection information and the beam grouping information; and
and transmitting report information to the base station based on the configuration information, wherein the report information includes first information and second information;
The first information includes information indicating the first transmission beam and a maximum reference signal received power (RSRP) value for the first transmission beam,
The second information includes information indicating the second transmission beam and a differential RSRP value for the second transmission beam with respect to the maximum RSRP for the first transmission beam,
The at least one reception beam of the terminal is usable for receiving a first signal on the first transmission beam and a second signal on the second transmission beam.
The method according to claim 1,
The at least one reception beam of the terminal includes a reception beam of one panel of the terminal,
The first signal on the first transmit beam and the second signal on the second transmit beam may be simultaneously received using the receive beam of one panel of the terminal.
The method according to claim 1,
The at least one receive beam of the terminal includes receive beams of multiple panels of the terminal,
The first signal on the first transmission beam and the second signal on the second transmission beam may be simultaneously received using always-receiving beams of multiple panels of the terminal.
The method according to claim 1,
The maximum reference signal received power (RSRP) value indicates a reference channel quality measured for the first transmission beam,
The differential RSRP value indicates a difference between the channel quality measured in the second transmission beam and the reference channel quality.
5. The method according to claim 4,
the first transmit beam is identified from among a plurality of transmit beams of the base station;
The maximum RSRP value is the largest value among a plurality of RSRP values for the plurality of transmission beams.
The method according to claim 1,
The signal based on the first transmission beam and the signal based on the second transmission beam are received in the same orthogonal frequency division multiplexing (OFDM) symbol based on the at least one reception beam of the terminal.
The method according to claim 1,
The method further comprising the step of transmitting, to the base station, capability information indicating whether the terminal supports reference signal received power (RSRP) reporting for at least two reference signals.
In a wireless communication system, in a method of operating a base station (BS),
A process of transmitting configuration information related to a CSI (channel state information) report to a user equipment (UE) through radio resource control (RRC), and the configuration information may be simultaneously received by the terminal including beam selection information and beam grouping information for configuring the terminal to report at least two beams of signals,
Receiving report information based on the configuration information from the terminal, wherein the report information includes first information and second information,
The first information includes information indicating a first transmission beam of the base station and a maximum reference signal received power (RSRP) value for the first transmission beam,
The second information includes information indicating a second transmission beam of the base station and a differential RSRP value for the second transmission beam with respect to the maximum RSRP for the first transmission beam,
The first transmission beam and the second transmission beam are identified based on the beam selection information and the beam grouping information;
The at least one reception beam of the terminal is usable for receiving a first signal on the first transmission beam and a second signal on the second transmission beam.
9. The method of claim 8,
The at least one reception beam of the terminal includes a reception beam of one panel of the terminal,
The first signal on the first transmit beam and the second signal on the second transmit beam may be simultaneously received using the receive beam of one panel of the terminal.
9. The method of claim 8,
The at least one receive beam of the terminal includes receive beams of multiple panels of the terminal,
The first signal on the first transmission beam and the second signal on the second transmission beam may be simultaneously received using always-receiving beams of multiple panels of the terminal.
9. The method of claim 8,
The maximum reference signal received power (RSRP) value indicates a reference channel quality measured for the first transmission beam,
The differential RSRP value indicates a difference between the channel quality measured in the second transmission beam and the reference channel quality.
12. The method of claim 11,
the first transmit beam is identified from among a plurality of transmit beams of the base station;
The maximum RSRP value is the largest value among a plurality of RSRP values for the plurality of transmission beams.
9. The method of claim 8,
The signal based on the first transmission beam and the signal based on the second transmission beam are received in the same orthogonal frequency division multiplexing (OFDM) symbol based on the at least one reception beam of the terminal.
9. The method of claim 8,
The method further comprising the step of receiving, from the terminal, capability information indicating whether the terminal supports reference signal received power (RSRP) reporting for at least two reference signals.
In a wireless communication system, in an apparatus of a user equipment (UE),
at least one transceiver;
at least one processor operatively coupled to the at least one transceiver;
The at least one processor,
Receive configuration information about a CSI (channel state information) report from the base station through radio resource control (RRC), and the configuration information is at least of signals that can be simultaneously received by the terminal Includes beam selection information and beam grouping information for configuring the terminal to report two beams,
identify a first transmit beam of the base station and a second transmit beam of the base station based on the beam selection information and the beam grouping information;
configured to transmit report information to the base station based on the configuration information;
The report information includes first information and second information,
The first information includes information indicating the first transmission beam and a maximum reference signal received power (RSRP) value for the first transmission beam,
The second information includes information indicating the second transmission beam and a differential RSRP value for the second transmission beam with respect to the maximum RSRP for the first transmission beam,
The at least one reception beam of the terminal is usable to receive a first signal on the first transmission beam and a second signal on the second transmission beam.
16. The method of claim 15,
The at least one reception beam of the terminal includes a reception beam of one panel of the terminal,
The first signal on the first transmission beam and the second signal on the second transmission beam may be simultaneously received using the reception beam of one panel of the terminal.
16. The method of claim 15,
The at least one receive beam of the terminal includes receive beams of multiple panels of the terminal,
The first signal on the first transmission beam and the second signal on the second transmission beam may be simultaneously received by using always-receiving beams of multiple panels of the terminal.
16. The method of claim 15,
The maximum reference signal received power (RSRP) value indicates a reference channel quality measured for the first transmission beam,
The differential RSRP value indicates a difference between the channel quality measured in the second transmission beam and the reference channel quality.
19. The method of claim 18,
the first transmit beam is identified from among a plurality of transmit beams of the base station;
The maximum RSRP value is the largest value among a plurality of RSRP values for the plurality of transmission beams.
16. The method of claim 15,
The signal based on the first transmission beam and the signal based on the second transmission beam are received in the same orthogonal frequency division multiplexing (OFDM) symbol based on the at least one reception beam of the terminal.
The method of claim 15 , wherein the at least one processor comprises:
The apparatus is further configured to transmit capability information indicating whether the terminal supports reference signal received power (RSRP) reporting for at least two reference signals to the base station.
In a wireless communication system, in the operating apparatus of a base station (BS),
at least one transceiver;
at least one processor operatively coupled to the at least one transceiver;
The at least one processor,
Through radio resource control (RRC), it transmits configuration information about a channel state information (CSI) report to a user equipment (UE), and the configuration information includes signals that can be simultaneously received by the terminal. Includes beam selection information and beam grouping information for configuring the terminal to report at least two beams,
configured to receive report information based on the configuration information from the terminal,
The report information includes first information and second information,
The first information includes information indicating a first transmission beam of the base station and a maximum reference signal received power (RSRP) value for the first transmission beam,
The second information includes information indicating a second transmission beam of the base station and a differential RSRP value for the second transmission beam with respect to the maximum RSRP for the first transmission beam,
The first transmission beam and the second transmission beam are identified based on the beam selection information and the beam grouping information,
The at least one reception beam of the terminal is usable to receive a first signal on the first transmission beam and a second signal on the second transmission beam.
23. The method of claim 22,
The at least one reception beam of the terminal includes a reception beam of one panel of the terminal,
The first signal on the first transmission beam and the second signal on the second transmission beam may be simultaneously received using the reception beam of one panel of the terminal.
23. The method of claim 22,
The at least one receive beam of the terminal includes receive beams of multiple panels of the terminal,
The first signal on the first transmission beam and the second signal on the second transmission beam may be simultaneously received by using always-receiving beams of multiple panels of the terminal.
23. The method of claim 22,
The maximum reference signal received power (RSRP) value indicates a reference channel quality measured for the first transmission beam,
The differential RSRP value indicates a difference between the channel quality measured in the second transmission beam and the reference channel quality.
26. The method of claim 25,
the first transmit beam is identified from among a plurality of transmit beams of the base station;
The maximum RSRP value is the largest value among a plurality of RSRP values for the plurality of transmission beams.
23. The method of claim 22,
The signal based on the first transmission beam and the signal based on the second transmission beam are received in the same orthogonal frequency division multiplexing (OFDM) symbol based on the at least one reception beam of the terminal.
26. The method of claim 25,
The method of claim 1, further comprising: receiving, from the terminal, capability information indicating whether the terminal supports reference signal received power (RSRP) reporting for two reference signals.
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